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_blind_id_verify_public_id
151 #define qd0_blind_id_verify_private_id d0_blind_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 static qboolean Crypto_SavePubKeyTextFile(int i)
780 if(!pubkeys_havepriv[i])
782 f = FS_SysOpen(va(vabuf, sizeof(vabuf), "%skey_%d-public-fp%s.txt", *fs_userdir ? fs_userdir : fs_basedir, i, sessionid.string), "w", false);
786 // we ignore errors for this file, as it's not necessary to have
787 FS_Printf(f, "ID-Fingerprint: %s\n", pubkeys_priv_fp64[i]);
788 FS_Printf(f, "ID-Is-Signed: %s\n", pubkeys_havesig[i] ? "yes" : "no");
789 FS_Printf(f, "ID-Is-For-Key: %s\n", pubkeys_fp64[i]);
791 FS_Printf(f, "This is a PUBLIC ID file for DarkPlaces.\n");
792 FS_Printf(f, "You are free to share this file or its contents.\n");
794 FS_Printf(f, "This file will be automatically generated again if deleted.\n");
796 FS_Printf(f, "However, NEVER share the accompanying SECRET ID file called\n");
797 FS_Printf(f, "key_%d.d0si%s, as doing so would compromise security!\n", i, sessionid.string);
803 void Crypto_LoadKeys(void)
810 if(!d0_blind_id_dll) // don't if we can't
813 if(crypto_idstring) // already loaded? then not
816 Host_LockSession(); // we use the session ID here
819 // note: we are just a CLIENT
821 // PUBLIC KEYS to accept (including modulus)
822 // PRIVATE KEY of user
824 crypto_idstring = NULL;
825 dpsnprintf(crypto_idstring_buf, sizeof(crypto_idstring_buf), "%d", d0_rijndael_dll ? crypto_aeslevel.integer : 0);
826 for(i = 0; i < MAX_PUBKEYS; ++i)
828 memset(pubkeys_fp64[i], 0, sizeof(pubkeys_fp64[i]));
829 memset(pubkeys_priv_fp64[i], 0, sizeof(pubkeys_fp64[i]));
830 pubkeys_havepriv[i] = false;
831 pubkeys_havesig[i] = false;
832 len = Crypto_LoadFile(va(vabuf, sizeof(vabuf), "key_%d.d0pk", i), buf, sizeof(buf), false);
833 if((pubkeys[i] = Crypto_ReadPublicKey(buf, len)))
836 if(qd0_blind_id_fingerprint64_public_key(pubkeys[i], pubkeys_fp64[i], &len2)) // keeps final NUL
838 Con_Printf("Loaded public key key_%d.d0pk (fingerprint: %s)\n", i, pubkeys_fp64[i]);
839 len = Crypto_LoadFile(va(vabuf, sizeof(vabuf), "key_%d.d0si%s", i, sessionid.string), buf, sizeof(buf), true);
842 if(Crypto_AddPrivateKey(pubkeys[i], buf, len))
845 if(qd0_blind_id_fingerprint64_public_id(pubkeys[i], pubkeys_priv_fp64[i], &len2)) // keeps final NUL
849 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]);
851 // verify the key we just loaded (just in case)
852 if(qd0_blind_id_verify_private_id(pubkeys[i]) && qd0_blind_id_verify_public_id(pubkeys[i], &status))
854 pubkeys_havepriv[i] = true;
855 strlcat(crypto_idstring_buf, va(vabuf, sizeof(vabuf), " %s@%s", pubkeys_priv_fp64[i], pubkeys_fp64[i]), sizeof(crypto_idstring_buf));
857 // verify the key we just got (just in case)
859 pubkeys_havesig[i] = true;
861 Con_Printf("NOTE: this ID has not yet been signed!\n");
863 Crypto_SavePubKeyTextFile(i);
867 Con_Printf("d0_blind_id_verify_private_id failed, this is not a valid key!\n");
868 qd0_blind_id_free(pubkeys[i]);
874 Con_Printf("d0_blind_id_fingerprint64_public_id failed\n");
875 qd0_blind_id_free(pubkeys[i]);
883 // can't really happen
884 qd0_blind_id_free(pubkeys[i]);
889 crypto_idstring = crypto_idstring_buf;
892 Crypto_BuildChallengeAppend();
894 // find a good prefix length for all the keys we know (yes, algorithm is not perfect yet, may yield too long prefix length)
895 crypto_keyfp_recommended_length = 0;
896 memset(buf+256, 0, MAX_PUBKEYS + MAX_PUBKEYS);
897 while(crypto_keyfp_recommended_length < FP64_SIZE)
900 for(i = 0; i < MAX_PUBKEYS; ++i)
904 ++buf[(unsigned char) pubkeys_fp64[i][crypto_keyfp_recommended_length]];
905 if(pubkeys_havepriv[i])
906 if(!buf[256 + MAX_PUBKEYS + i])
907 ++buf[(unsigned char) pubkeys_priv_fp64[i][crypto_keyfp_recommended_length]];
909 for(i = 0; i < MAX_PUBKEYS; ++i)
913 if(buf[(unsigned char) pubkeys_fp64[i][crypto_keyfp_recommended_length]] < 2)
915 if(pubkeys_havepriv[i])
916 if(!buf[256 + MAX_PUBKEYS + i])
917 if(buf[(unsigned char) pubkeys_priv_fp64[i][crypto_keyfp_recommended_length]] < 2)
918 buf[256 + MAX_PUBKEYS + i] = 1;
920 ++crypto_keyfp_recommended_length;
921 for(i = 0; i < MAX_PUBKEYS; ++i)
926 if(pubkeys_havepriv[i])
927 if(!buf[256 + MAX_PUBKEYS + i])
933 if(crypto_keyfp_recommended_length < 7)
934 crypto_keyfp_recommended_length = 7;
937 static void Crypto_UnloadKeys(void)
942 for(i = 0; i < MAX_PUBKEYS; ++i)
945 qd0_blind_id_free(pubkeys[i]);
947 pubkeys_havepriv[i] = false;
948 pubkeys_havesig[i] = false;
949 memset(pubkeys_fp64[i], 0, sizeof(pubkeys_fp64[i]));
950 memset(pubkeys_priv_fp64[i], 0, sizeof(pubkeys_fp64[i]));
951 challenge_append_length = 0;
953 crypto_idstring = NULL;
956 static mempool_t *cryptomempool;
962 static void *Crypto_d0_malloc(size_t len)
964 return Mem_Alloc(cryptomempool, len);
967 static void Crypto_d0_free(void *p)
972 static void *Crypto_d0_createmutex(void)
974 return Thread_CreateMutex();
977 static void Crypto_d0_destroymutex(void *m)
979 Thread_DestroyMutex(m);
982 static int Crypto_d0_lockmutex(void *m)
984 return Thread_LockMutex(m);
987 static int Crypto_d0_unlockmutex(void *m)
989 return Thread_UnlockMutex(m);
995 void Crypto_Shutdown(void)
1000 Crypto_Rijndael_CloseLibrary();
1005 for(i = 0; i < MAX_CRYPTOCONNECTS; ++i)
1007 crypto = &cryptoconnects[i].crypto;
1010 memset(cryptoconnects, 0, sizeof(cryptoconnects));
1011 crypto = &cls.crypto;
1014 Crypto_UnloadKeys();
1016 qd0_blind_id_SHUTDOWN();
1018 Crypto_CloseLibrary();
1021 Mem_FreePool(&cryptomempool);
1024 void Crypto_Init(void)
1026 cryptomempool = Mem_AllocPool("crypto", 0, NULL);
1028 if(!Crypto_OpenLibrary())
1031 qd0_blind_id_setmallocfuncs(Crypto_d0_malloc, Crypto_d0_free);
1032 if (Thread_HasThreads())
1033 qd0_blind_id_setmutexfuncs(Crypto_d0_createmutex, Crypto_d0_destroymutex, Crypto_d0_lockmutex, Crypto_d0_unlockmutex);
1035 if(!qd0_blind_id_INITIALIZE())
1037 Crypto_Rijndael_CloseLibrary();
1038 Crypto_CloseLibrary();
1039 Con_Printf("libd0_blind_id initialization FAILED, cryptography support has been disabled\n");
1043 (void) Crypto_Rijndael_OpenLibrary(); // if this fails, it's uncritical
1045 Crypto_InitHostKeys();
1049 qboolean Crypto_Available(void)
1051 if(!d0_blind_id_dll)
1057 static void Crypto_KeyGen_Finished(int code, size_t length_received, unsigned char *buffer, void *cbdata)
1061 static char buf[8192];
1062 static char buf2[8192];
1068 SV_LockThreadMutex();
1070 if(!d0_blind_id_dll)
1072 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1074 SV_UnlockThreadMutex();
1078 if(keygen_i >= MAX_PUBKEYS || !pubkeys[keygen_i])
1080 Con_Printf("overflow of keygen_i\n");
1082 SV_UnlockThreadMutex();
1087 Con_Printf("Unexpected response from keygen server:\n");
1088 Com_HexDumpToConsole(buffer, length_received);
1089 SV_UnlockThreadMutex();
1092 if(!Crypto_ParsePack((const char *) buffer, length_received, FOURCC_D0IR, p, l, 1))
1094 if(length_received >= 5 && Crypto_LittleLong((const char *) buffer) == FOURCC_D0ER)
1096 Con_Printf("Error response from keygen server: %.*s\n", (int)(length_received - 5), buffer + 5);
1100 Con_Printf("Invalid response from keygen server:\n");
1101 Com_HexDumpToConsole(buffer, length_received);
1104 SV_UnlockThreadMutex();
1107 if(!qd0_blind_id_finish_private_id_request(pubkeys[keygen_i], p[0], l[0]))
1109 Con_Printf("d0_blind_id_finish_private_id_request failed\n");
1111 SV_UnlockThreadMutex();
1115 // verify the key we just got (just in case)
1116 if(!qd0_blind_id_verify_public_id(pubkeys[keygen_i], &status) || !status)
1118 Con_Printf("d0_blind_id_verify_public_id failed\n");
1120 SV_UnlockThreadMutex();
1124 // we have a valid key now!
1125 // make the rest of crypto.c know that
1126 Con_Printf("Received signature for private ID key_%d.d0pk (public key fingerprint: %s)\n", keygen_i, pubkeys_priv_fp64[keygen_i]);
1127 pubkeys_havesig[keygen_i] = true;
1129 // write the key to disk
1132 if(!qd0_blind_id_write_private_id(pubkeys[keygen_i], buf, &l[0]))
1134 Con_Printf("d0_blind_id_write_private_id failed\n");
1136 SV_UnlockThreadMutex();
1139 if(!(buf2size = Crypto_UnParsePack(buf2, sizeof(buf2), FOURCC_D0SI, p, l, 1)))
1141 Con_Printf("Crypto_UnParsePack failed\n");
1143 SV_UnlockThreadMutex();
1147 FS_CreatePath(va(vabuf, sizeof(vabuf), "%skey_%d.d0si%s", *fs_userdir ? fs_userdir : fs_basedir, keygen_i, sessionid.string));
1148 f = FS_SysOpen(va(vabuf, sizeof(vabuf), "%skey_%d.d0si%s", *fs_userdir ? fs_userdir : fs_basedir, keygen_i, sessionid.string), "wb", false);
1151 Con_Printf("Cannot open key_%d.d0si%s\n", keygen_i, sessionid.string);
1153 SV_UnlockThreadMutex();
1156 FS_Write(f, buf2, buf2size);
1159 Crypto_SavePubKeyTextFile(keygen_i);
1161 Con_Printf("Saved to key_%d.d0si%s\n", keygen_i, sessionid.string);
1164 SV_UnlockThreadMutex();
1167 static void Crypto_KeyGen_f(void)
1172 static char buf[8192];
1173 static char buf2[8192];
1175 size_t buf2l, buf2pos;
1180 if(!d0_blind_id_dll)
1182 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1187 Con_Printf("usage:\n%s id url\n", Cmd_Argv(0));
1190 SV_LockThreadMutex();
1192 i = atoi(Cmd_Argv(1));
1195 Con_Printf("there is no public key %d\n", i);
1196 SV_UnlockThreadMutex();
1201 Con_Printf("there is already a keygen run on the way\n");
1202 SV_UnlockThreadMutex();
1207 // how to START the keygenning...
1208 if(pubkeys_havepriv[keygen_i])
1210 if(pubkeys_havesig[keygen_i])
1212 Con_Printf("there is already a signed private key for %d\n", i);
1214 SV_UnlockThreadMutex();
1217 // if we get here, we only need a signature, no new keygen run needed
1218 Con_Printf("Only need a signature for an existing key...\n");
1222 // we also need a new ID itself
1223 if(!qd0_blind_id_generate_private_id_start(pubkeys[keygen_i]))
1225 Con_Printf("d0_blind_id_start failed\n");
1227 SV_UnlockThreadMutex();
1230 // verify the key we just got (just in case)
1231 if(!qd0_blind_id_verify_private_id(pubkeys[keygen_i]))
1233 Con_Printf("d0_blind_id_verify_private_id failed\n");
1235 SV_UnlockThreadMutex();
1238 // we have a valid key now!
1239 // make the rest of crypto.c know that
1241 if(qd0_blind_id_fingerprint64_public_id(pubkeys[keygen_i], pubkeys_priv_fp64[keygen_i], &len2)) // keeps final NUL
1243 Con_Printf("Generated private ID key_%d.d0pk (public key fingerprint: %s)\n", keygen_i, pubkeys_priv_fp64[keygen_i]);
1244 pubkeys_havepriv[keygen_i] = true;
1245 strlcat(crypto_idstring_buf, va(vabuf, sizeof(vabuf), " %s@%s", pubkeys_priv_fp64[keygen_i], pubkeys_fp64[keygen_i]), sizeof(crypto_idstring_buf));
1246 crypto_idstring = crypto_idstring_buf;
1247 Crypto_BuildChallengeAppend();
1249 // write the key to disk
1252 if(!qd0_blind_id_write_private_id(pubkeys[keygen_i], buf, &l[0]))
1254 Con_Printf("d0_blind_id_write_private_id failed\n");
1256 SV_UnlockThreadMutex();
1259 if(!(buf2size = Crypto_UnParsePack(buf2, sizeof(buf2), FOURCC_D0SI, p, l, 1)))
1261 Con_Printf("Crypto_UnParsePack failed\n");
1263 SV_UnlockThreadMutex();
1267 FS_CreatePath(va(vabuf, sizeof(vabuf), "%skey_%d.d0si%s", *fs_userdir ? fs_userdir : fs_basedir, keygen_i, sessionid.string));
1268 f = FS_SysOpen(va(vabuf, sizeof(vabuf), "%skey_%d.d0si%s", *fs_userdir ? fs_userdir : fs_basedir, keygen_i, sessionid.string), "wb", false);
1271 Con_Printf("Cannot open key_%d.d0si%s\n", keygen_i, sessionid.string);
1273 SV_UnlockThreadMutex();
1276 FS_Write(f, buf2, buf2size);
1279 Crypto_SavePubKeyTextFile(keygen_i);
1281 Con_Printf("Saved unsigned key to key_%d.d0si%s\n", keygen_i, sessionid.string);
1285 if(!qd0_blind_id_generate_private_id_request(pubkeys[keygen_i], buf, &l[0]))
1287 Con_Printf("d0_blind_id_generate_private_id_request failed\n");
1289 SV_UnlockThreadMutex();
1292 buf2pos = strlen(Cmd_Argv(2));
1293 memcpy(buf2, Cmd_Argv(2), buf2pos);
1294 if(!(buf2l = Crypto_UnParsePack(buf2 + buf2pos, sizeof(buf2) - buf2pos - 1, FOURCC_D0IQ, p, l, 1)))
1296 Con_Printf("Crypto_UnParsePack failed\n");
1298 SV_UnlockThreadMutex();
1301 if(!(buf2l = base64_encode((unsigned char *) (buf2 + buf2pos), buf2l, sizeof(buf2) - buf2pos - 1)))
1303 Con_Printf("base64_encode failed\n");
1305 SV_UnlockThreadMutex();
1310 if(!Curl_Begin_ToMemory(buf2, 0, (unsigned char *) keygen_buf, sizeof(keygen_buf), Crypto_KeyGen_Finished, NULL))
1312 Con_Printf("curl failed\n");
1314 SV_UnlockThreadMutex();
1317 Con_Printf("Signature generation in progress...\n");
1318 SV_UnlockThreadMutex();
1323 static void Crypto_Reload_f(void)
1325 Crypto_ClearHostKeys();
1326 Crypto_UnloadKeys();
1330 static void Crypto_Keys_f(void)
1333 if(!d0_blind_id_dll)
1335 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1338 for(i = 0; i < MAX_PUBKEYS; ++i)
1342 Con_Printf("%2d: public key key_%d.d0pk (fingerprint: %s)\n", i, i, pubkeys_fp64[i]);
1343 if(pubkeys_havepriv[i])
1345 Con_Printf(" private ID key_%d.d0si%s (public key fingerprint: %s)\n", i, sessionid.string, pubkeys_priv_fp64[i]);
1346 if(!pubkeys_havesig[i])
1347 Con_Printf(" NOTE: this ID has not yet been signed!\n");
1353 static void Crypto_HostKeys_f(void)
1356 crypto_storedhostkey_t *hk;
1359 if(!d0_blind_id_dll)
1361 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1364 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
1366 for(hk = crypto_storedhostkey_hashtable[i]; hk; hk = hk->next)
1368 LHNETADDRESS_ToString(&hk->addr, buf, sizeof(buf), 1);
1369 Con_Printf("%d %s@%.*s %s\n",
1372 crypto_keyfp_recommended_length, pubkeys_fp64[hk->keyid],
1378 static void Crypto_HostKey_Clear_f(void)
1380 lhnetaddress_t addr;
1383 if(!d0_blind_id_dll)
1385 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1389 for(i = 1; i < Cmd_Argc(); ++i)
1391 LHNETADDRESS_FromString(&addr, Cmd_Argv(i), 26000);
1392 if(Crypto_ClearHostKey(&addr))
1394 Con_Printf("cleared host key for %s\n", Cmd_Argv(i));
1399 void Crypto_Init_Commands(void)
1403 Cmd_AddCommand("crypto_reload", Crypto_Reload_f, "reloads cryptographic keys");
1404 Cmd_AddCommand("crypto_keygen", Crypto_KeyGen_f, "generates and saves a cryptographic key");
1405 Cmd_AddCommand("crypto_keys", Crypto_Keys_f, "lists the loaded keys");
1406 Cmd_AddCommand("crypto_hostkeys", Crypto_HostKeys_f, "lists the cached host keys");
1407 Cmd_AddCommand("crypto_hostkey_clear", Crypto_HostKey_Clear_f, "clears a cached host key");
1408 Cvar_RegisterVariable(&crypto_developer);
1410 Cvar_RegisterVariable(&crypto_aeslevel);
1412 crypto_aeslevel.integer = 0; // make sure
1413 Cvar_RegisterVariable(&crypto_servercpupercent);
1414 Cvar_RegisterVariable(&crypto_servercpumaxtime);
1415 Cvar_RegisterVariable(&crypto_servercpudebug);
1421 static void aescpy(unsigned char *key, const unsigned char *iv, unsigned char *dst, const unsigned char *src, size_t len)
1423 const unsigned char *xorpos = iv;
1424 unsigned char xorbuf[16];
1425 unsigned long rk[D0_RIJNDAEL_RKLENGTH(DHKEY_SIZE * 8)];
1427 qd0_rijndael_setup_encrypt(rk, key, DHKEY_SIZE * 8);
1430 for(i = 0; i < 16; ++i)
1431 xorbuf[i] = src[i] ^ xorpos[i];
1432 qd0_rijndael_encrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), xorbuf, dst);
1440 for(i = 0; i < len; ++i)
1441 xorbuf[i] = src[i] ^ xorpos[i];
1443 xorbuf[i] = xorpos[i];
1444 qd0_rijndael_encrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), xorbuf, dst);
1447 static void seacpy(unsigned char *key, const unsigned char *iv, unsigned char *dst, const unsigned char *src, size_t len)
1449 const unsigned char *xorpos = iv;
1450 unsigned char xorbuf[16];
1451 unsigned long rk[D0_RIJNDAEL_RKLENGTH(DHKEY_SIZE * 8)];
1453 qd0_rijndael_setup_decrypt(rk, key, DHKEY_SIZE * 8);
1456 qd0_rijndael_decrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), src, xorbuf);
1457 for(i = 0; i < 16; ++i)
1458 dst[i] = xorbuf[i] ^ xorpos[i];
1466 qd0_rijndael_decrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), src, xorbuf);
1467 for(i = 0; i < len; ++i)
1468 dst[i] = xorbuf[i] ^ xorpos[i];
1472 // NOTE: we MUST avoid the following begins of the packet:
1473 // 1. 0xFF, 0xFF, 0xFF, 0xFF
1474 // 2. 0x80, 0x00, length/256, length%256
1475 // this luckily does NOT affect AES mode, where the first byte always is in the range from 0x00 to 0x0F
1476 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)
1478 unsigned char h[32];
1480 if(crypto->authenticated)
1484 // AES packet = 1 byte length overhead, 15 bytes from HMAC-SHA-256, data, 0..15 bytes padding
1485 // 15 bytes HMAC-SHA-256 (112bit) suffice as the attacker can't do more than forge a random-looking packet
1486 // HMAC is needed to not leak information about packet content
1487 if(developer_networking.integer)
1489 Con_Print("To be encrypted:\n");
1490 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1492 if(len_src + 32 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, len_src, crypto->dhkey, DHKEY_SIZE))
1494 Con_Printf("Crypto_EncryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1497 *len_dst = ((len_src + 15) / 16) * 16 + 16; // add 16 for HMAC, then round to 16-size for AES
1498 ((unsigned char *) data_dst)[0] = *len_dst - len_src;
1499 memcpy(((unsigned char *) data_dst)+1, h, 15);
1500 aescpy(crypto->dhkey, (const unsigned char *) data_dst, ((unsigned char *) data_dst) + 16, (const unsigned char *) data_src, len_src);
1505 // HMAC packet = 16 bytes HMAC-SHA-256 (truncated to 128 bits), data
1506 if(len_src + 16 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, len_src, crypto->dhkey, DHKEY_SIZE))
1508 Con_Printf("Crypto_EncryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1511 *len_dst = len_src + 16;
1512 memcpy(data_dst, h, 16);
1513 memcpy(((unsigned char *) data_dst) + 16, (unsigned char *) data_src, len_src);
1515 // handle the "avoid" conditions:
1516 i = BuffBigLong((unsigned char *) data_dst);
1518 (i == (int)0xFFFFFFFF) // avoid QW control packet
1520 (i == (int)0x80000000 + (int)*len_dst) // avoid NQ control packet
1522 *(unsigned char *)data_dst ^= 0x80; // this will ALWAYS fix it
1533 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)
1535 unsigned char h[32];
1538 // silently handle non-crypto packets
1539 i = BuffBigLong((unsigned char *) data_src);
1541 (i == (int)0xFFFFFFFF) // avoid QW control packet
1543 (i == (int)0x80000000 + (int)len_src) // avoid NQ control packet
1547 if(crypto->authenticated)
1551 if(len_src < 16 || ((len_src - 16) % 16))
1553 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1556 *len_dst = len_src - ((unsigned char *) data_src)[0];
1557 if(len < *len_dst || *len_dst > len_src - 16)
1559 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d->%d bytes out)\n", (int) len_src, (int) *len_dst, (int) len);
1562 seacpy(crypto->dhkey, (unsigned char *) data_src, (unsigned char *) data_dst, ((const unsigned char *) data_src) + 16, *len_dst);
1564 if(!HMAC_SHA256_32BYTES(h, (const unsigned char *) data_dst, *len_dst, crypto->dhkey, DHKEY_SIZE))
1566 Con_Printf("HMAC fail\n");
1569 if(memcmp(((const unsigned char *) data_src)+1, h, 15)) // ignore first byte, used for length
1571 Con_Printf("HMAC mismatch\n");
1574 if(developer_networking.integer)
1576 Con_Print("Decrypted:\n");
1577 Com_HexDumpToConsole((const unsigned char *) data_dst, *len_dst);
1579 return data_dst; // no need to copy
1585 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1588 *len_dst = len_src - 16;
1591 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d->%d bytes out)\n", (int) len_src, (int) *len_dst, (int) len);
1594 //memcpy(data_dst, data_src + 16, *len_dst);
1595 if(!HMAC_SHA256_32BYTES(h, ((const unsigned char *) data_src) + 16, *len_dst, crypto->dhkey, DHKEY_SIZE))
1597 Con_Printf("HMAC fail\n");
1598 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1602 if(memcmp((const unsigned char *) data_src, h, 16)) // ignore first byte, used for length
1604 // undo the "avoid conditions"
1606 (i == (int)0x7FFFFFFF) // avoided QW control packet
1608 (i == (int)0x00000000 + (int)len_src) // avoided NQ control packet
1611 // do the avoidance on the hash too
1613 if(memcmp((const unsigned char *) data_src, h, 16)) // ignore first byte, used for length
1615 Con_Printf("HMAC mismatch\n");
1616 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1622 Con_Printf("HMAC mismatch\n");
1623 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1627 return ((const unsigned char *) data_src) + 16; // no need to copy, so data_dst is not used
1638 const char *Crypto_GetInfoResponseDataString(void)
1640 crypto_idstring_buf[0] = '0' + crypto_aeslevel.integer;
1641 return crypto_idstring;
1645 qboolean Crypto_ServerAppendToChallenge(const char *data_in, size_t len_in, char *data_out, size_t *len_out, size_t maxlen_out)
1647 // cheap op, all is precomputed
1648 if(!d0_blind_id_dll)
1649 return false; // no support
1651 if(maxlen_out <= *len_out + challenge_append_length)
1653 memcpy(data_out + *len_out, challenge_append, challenge_append_length);
1654 *len_out += challenge_append_length;
1658 static int Crypto_ServerError(char *data_out, size_t *len_out, const char *msg, const char *msg_client)
1662 Con_DPrintf("rejecting client: %s\n", msg);
1664 dpsnprintf(data_out, *len_out, "reject %s", msg_client);
1665 *len_out = strlen(data_out);
1666 return CRYPTO_DISCARD;
1669 static int Crypto_SoftServerError(char *data_out, size_t *len_out, const char *msg)
1672 Con_DPrintf("%s\n", msg);
1673 return CRYPTO_DISCARD;
1676 static int Crypto_ServerParsePacket_Internal(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
1678 // if "connect": reject if in the middle of crypto handshake
1679 crypto_t *crypto = NULL;
1680 char *data_out_p = data_out;
1681 const char *string = data_in;
1685 char infostringvalue[MAX_INPUTLINE];
1688 if(!d0_blind_id_dll)
1689 return CRYPTO_NOMATCH; // no support
1691 if (len_in > 8 && !memcmp(string, "connect\\", 8) && d0_rijndael_dll && crypto_aeslevel.integer >= 3)
1695 // sorry, we have to verify the challenge here to not reflect network spam
1697 if (!(s = InfoString_GetValue(string + 4, "challenge", infostringvalue, sizeof(infostringvalue))))
1698 return CRYPTO_NOMATCH; // will be later accepted if encryption was set up
1699 // validate the challenge
1700 for (i = 0;i < MAX_CHALLENGES;i++)
1701 if(challenge[i].time > 0)
1702 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1704 // if the challenge is not recognized, drop the packet
1705 if (i == MAX_CHALLENGES) // challenge mismatch is silent
1706 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1708 crypto = Crypto_ServerFindInstance(peeraddress, false);
1709 if(!crypto || !crypto->authenticated)
1710 return Crypto_ServerError(data_out, len_out, "This server requires authentication and encryption to be supported by your client", NULL);
1712 else if(len_in > 5 && !memcmp(string, "d0pk\\", 5) && ((LHNETADDRESS_GetAddressType(peeraddress) == LHNETADDRESSTYPE_LOOP) || sv_public.integer > -3))
1714 const char *cnt, *s, *p;
1716 int clientid = -1, serverid = -1;
1717 cnt = InfoString_GetValue(string + 4, "id", infostringvalue, sizeof(infostringvalue));
1718 id = (cnt ? atoi(cnt) : -1);
1719 cnt = InfoString_GetValue(string + 4, "cnt", infostringvalue, sizeof(infostringvalue));
1721 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1722 GetUntilNul(&data_in, &len_in);
1724 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1725 if(!strcmp(cnt, "0"))
1728 if (!(s = InfoString_GetValue(string + 4, "challenge", infostringvalue, sizeof(infostringvalue))))
1729 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1730 // validate the challenge
1731 for (i = 0;i < MAX_CHALLENGES;i++)
1732 if(challenge[i].time > 0)
1733 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1735 // if the challenge is not recognized, drop the packet
1736 if (i == MAX_CHALLENGES) // challenge mismatch is silent
1737 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1739 if (!(s = InfoString_GetValue(string + 4, "aeslevel", infostringvalue, sizeof(infostringvalue))))
1740 aeslevel = 0; // not supported
1742 aeslevel = bound(0, atoi(s), 3);
1743 switch(bound(0, d0_rijndael_dll ? crypto_aeslevel.integer : 0, 3))
1745 default: // dummy, never happens, but to make gcc happy...
1748 return Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL);
1752 aes = (aeslevel >= 2);
1755 aes = (aeslevel >= 1);
1759 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);
1764 p = GetUntilNul(&data_in, &len_in);
1767 for(i = 0; i < MAX_PUBKEYS; ++i)
1770 if(!strcmp(p, pubkeys_fp64[i]))
1771 if(pubkeys_havepriv[i])
1776 return Crypto_ServerError(data_out, len_out, "Invalid server key", NULL);
1778 p = GetUntilNul(&data_in, &len_in);
1781 for(i = 0; i < MAX_PUBKEYS; ++i)
1784 if(!strcmp(p, pubkeys_fp64[i]))
1789 return Crypto_ServerError(data_out, len_out, "Invalid client key", NULL);
1792 crypto = Crypto_ServerFindInstance(peeraddress, true);
1794 return Crypto_ServerError(data_out, len_out, "Could not create a crypto connect instance", NULL);
1796 CDATA->cdata_id = id;
1797 CDATA->s = serverid;
1798 CDATA->c = clientid;
1799 memset(crypto->dhkey, 0, sizeof(crypto->dhkey));
1800 CDATA->challenge[0] = 0;
1801 crypto->client_keyfp[0] = 0;
1802 crypto->client_idfp[0] = 0;
1803 crypto->server_keyfp[0] = 0;
1804 crypto->server_idfp[0] = 0;
1805 crypto->use_aes = aes != 0;
1809 // I am the server, and my key is ok... so let's set server_keyfp and server_idfp
1810 strlcpy(crypto->server_keyfp, pubkeys_fp64[CDATA->s], sizeof(crypto->server_keyfp));
1811 strlcpy(crypto->server_idfp, pubkeys_priv_fp64[CDATA->s], sizeof(crypto->server_idfp));
1814 CDATA->id = qd0_blind_id_new();
1818 return Crypto_ServerError(data_out, len_out, "d0_blind_id_new failed", "Internal error");
1820 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->s]))
1823 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1825 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\1\\id\\%d\\aes\\%d", CDATA->cdata_id, crypto->use_aes));
1826 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
1829 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed", "Internal error");
1831 CDATA->next_step = 2;
1832 data_out_p += *len_out;
1833 *len_out = data_out_p - data_out;
1834 return CRYPTO_DISCARD;
1836 else if(CDATA->c >= 0)
1839 CDATA->id = qd0_blind_id_new();
1843 return Crypto_ServerError(data_out, len_out, "d0_blind_id_new failed", "Internal error");
1845 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
1848 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1850 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\5\\id\\%d\\aes\\%d", CDATA->cdata_id, crypto->use_aes));
1851 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
1854 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed", "Internal error");
1856 CDATA->next_step = 6;
1857 data_out_p += *len_out;
1858 *len_out = data_out_p - data_out;
1859 return CRYPTO_DISCARD;
1864 return Crypto_ServerError(data_out, len_out, "Missing client and server key", NULL);
1867 else if(!strcmp(cnt, "2"))
1870 crypto = Crypto_ServerFindInstance(peeraddress, false);
1872 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1874 if(CDATA->cdata_id != id)
1875 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1876 if(CDATA->next_step != 2)
1877 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1879 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\3\\id\\%d", CDATA->cdata_id));
1880 if(!qd0_blind_id_authenticate_with_private_id_response(CDATA->id, data_in, len_in, data_out_p, len_out))
1883 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_response failed", "Internal error");
1885 fpbuflen = DHKEY_SIZE;
1886 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) crypto->dhkey, &fpbuflen))
1889 return Crypto_ServerError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed", "Internal error");
1893 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
1896 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1898 CDATA->next_step = 4;
1902 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
1903 crypto->authenticated = true;
1904 CDATA->next_step = 0;
1906 data_out_p += *len_out;
1907 *len_out = data_out_p - data_out;
1908 return CRYPTO_DISCARD;
1910 else if(!strcmp(cnt, "4"))
1912 crypto = Crypto_ServerFindInstance(peeraddress, false);
1914 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1916 if(CDATA->cdata_id != id)
1917 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1918 if(CDATA->next_step != 4)
1919 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1920 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\5\\id\\%d", CDATA->cdata_id));
1921 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
1924 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed", "Internal error");
1926 CDATA->next_step = 6;
1927 data_out_p += *len_out;
1928 *len_out = data_out_p - data_out;
1929 return CRYPTO_DISCARD;
1931 else if(!strcmp(cnt, "6"))
1933 static char msgbuf[32];
1934 size_t msgbuflen = sizeof(msgbuf);
1937 unsigned char dhkey[DHKEY_SIZE];
1938 crypto = Crypto_ServerFindInstance(peeraddress, false);
1940 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1942 if(CDATA->cdata_id != id)
1943 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1944 if(CDATA->next_step != 6)
1945 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1947 if(!qd0_blind_id_authenticate_with_private_id_verify(CDATA->id, data_in, len_in, msgbuf, &msgbuflen, &status))
1950 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_verify failed (authentication error)", "Authentication error");
1953 strlcpy(crypto->client_keyfp, pubkeys_fp64[CDATA->c], sizeof(crypto->client_keyfp));
1955 crypto->client_keyfp[0] = 0;
1956 memset(crypto->client_idfp, 0, sizeof(crypto->client_idfp));
1957 fpbuflen = FP64_SIZE;
1958 if(!qd0_blind_id_fingerprint64_public_id(CDATA->id, crypto->client_idfp, &fpbuflen))
1961 return Crypto_ServerError(data_out, len_out, "d0_blind_id_fingerprint64_public_id failed", "Internal error");
1963 fpbuflen = DHKEY_SIZE;
1964 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) dhkey, &fpbuflen))
1967 return Crypto_ServerError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed", "Internal error");
1969 // XOR the two DH keys together to make one
1970 for(i = 0; i < DHKEY_SIZE; ++i)
1971 crypto->dhkey[i] ^= dhkey[i];
1973 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
1974 crypto->authenticated = true;
1975 CDATA->next_step = 0;
1976 // send a challenge-less challenge
1977 PutWithNul(&data_out_p, len_out, "challenge ");
1978 *len_out = data_out_p - data_out;
1979 --*len_out; // remove NUL terminator
1980 return CRYPTO_MATCH;
1982 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1984 return CRYPTO_NOMATCH;
1987 int Crypto_ServerParsePacket(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
1991 static double complain_time = 0;
1993 qboolean do_time = false;
1994 qboolean do_reject = false;
1995 char infostringvalue[MAX_INPUTLINE];
1996 if(crypto_servercpupercent.value > 0 || crypto_servercpumaxtime.value > 0)
1997 if(len_in > 5 && !memcmp(data_in, "d0pk\\", 5))
2000 cnt = InfoString_GetValue(data_in + 4, "cnt", infostringvalue, sizeof(infostringvalue));
2002 if(!strcmp(cnt, "0"))
2007 // check if we may perform crypto...
2008 if(crypto_servercpupercent.value > 0)
2010 crypto_servercpu_accumulator += (realtime - crypto_servercpu_lastrealtime) * crypto_servercpupercent.value * 0.01;
2011 if(crypto_servercpumaxtime.value)
2012 if(crypto_servercpu_accumulator > crypto_servercpumaxtime.value)
2013 crypto_servercpu_accumulator = crypto_servercpumaxtime.value;
2017 if(crypto_servercpumaxtime.value > 0)
2018 if(realtime != crypto_servercpu_lastrealtime)
2019 crypto_servercpu_accumulator = crypto_servercpumaxtime.value;
2021 crypto_servercpu_lastrealtime = realtime;
2022 if(do_reject && crypto_servercpu_accumulator < 0)
2024 if(realtime > complain_time + 5)
2025 Con_Printf("crypto: cannot perform requested crypto operations; denial service attack or crypto_servercpupercent/crypto_servercpumaxtime are too low\n");
2027 return CRYPTO_DISCARD;
2029 t = Sys_DirtyTime();
2031 ret = Crypto_ServerParsePacket_Internal(data_in, len_in, data_out, len_out, peeraddress);
2034 t = Sys_DirtyTime() - t;if (t < 0.0) t = 0.0; // dirtytime can step backwards
2035 if(crypto_servercpudebug.integer)
2036 Con_Printf("crypto: accumulator was %.1f ms, used %.1f ms for crypto, ", crypto_servercpu_accumulator * 1000, t * 1000);
2037 crypto_servercpu_accumulator -= t;
2038 if(crypto_servercpudebug.integer)
2039 Con_Printf("is %.1f ms\n", crypto_servercpu_accumulator * 1000);
2044 static int Crypto_ClientError(char *data_out, size_t *len_out, const char *msg)
2046 dpsnprintf(data_out, *len_out, "reject %s", msg);
2047 *len_out = strlen(data_out);
2048 return CRYPTO_REPLACE;
2051 static int Crypto_SoftClientError(char *data_out, size_t *len_out, const char *msg)
2054 Con_Printf("%s\n", msg);
2055 return CRYPTO_DISCARD;
2058 int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
2060 crypto_t *crypto = &cls.crypto;
2061 const char *string = data_in;
2064 char *data_out_p = data_out;
2066 char infostringvalue[MAX_INPUTLINE];
2069 if(!d0_blind_id_dll)
2070 return CRYPTO_NOMATCH; // no support
2072 // if "challenge": verify challenge, and discard message, send next crypto protocol message instead
2073 // otherwise, just handle actual protocol messages
2075 if (len_in == 6 && !memcmp(string, "accept", 6) && cls.connect_trying && d0_rijndael_dll)
2077 int wantserverid = -1;
2078 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL);
2079 if(!crypto || !crypto->authenticated) // we ALSO get here if we are using an encrypted connection, so let's rule this out
2081 if(wantserverid >= 0)
2082 return Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present");
2083 if(crypto_aeslevel.integer >= 3)
2084 return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
2086 return CRYPTO_NOMATCH;
2088 else if (len_in >= 1 && string[0] == 'j' && cls.connect_trying && d0_rijndael_dll)
2090 int wantserverid = -1;
2091 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL);
2092 //if(!crypto || !crypto->authenticated)
2094 if(wantserverid >= 0)
2095 return Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present");
2096 if(crypto_aeslevel.integer >= 3)
2097 return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
2099 return CRYPTO_NOMATCH;
2101 else if (len_in >= 5 && BuffLittleLong((unsigned char *) string) == ((int)NETFLAG_CTL | (int)len_in))
2103 int wantserverid = -1;
2105 // these three are harmless
2106 if(string[4] == CCREP_SERVER_INFO)
2107 return CRYPTO_NOMATCH;
2108 if(string[4] == CCREP_PLAYER_INFO)
2109 return CRYPTO_NOMATCH;
2110 if(string[4] == CCREP_RULE_INFO)
2111 return CRYPTO_NOMATCH;
2113 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL);
2114 //if(!crypto || !crypto->authenticated)
2116 if(wantserverid >= 0)
2117 return Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present");
2118 if(crypto_aeslevel.integer >= 3)
2119 return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
2121 return CRYPTO_NOMATCH;
2123 else if (len_in >= 13 && !memcmp(string, "infoResponse\x0A", 13))
2125 s = InfoString_GetValue(string + 13, "d0_blind_id", infostringvalue, sizeof(infostringvalue));
2127 Crypto_StoreHostKey(peeraddress, s, true);
2128 return CRYPTO_NOMATCH;
2130 else if (len_in >= 15 && !memcmp(string, "statusResponse\x0A", 15))
2134 p = strchr(string + 15, '\n');
2138 * (char *) p = 0; // cut off the string there
2140 s = InfoString_GetValue(string + 15, "d0_blind_id", infostringvalue, sizeof(infostringvalue));
2142 Crypto_StoreHostKey(peeraddress, s, true);
2145 * (char *) p = save;
2146 // invoking those nasal demons again (do not run this on the DS9k)
2148 return CRYPTO_NOMATCH;
2150 else if(len_in > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
2152 const char *vlen_blind_id_ptr = NULL;
2153 size_t len_blind_id_ptr = 0;
2155 const char *challenge = data_in + 10;
2158 int clientid = -1, serverid = -1, wantserverid = -1;
2159 qboolean server_can_auth = true;
2160 char wantserver_idfp[FP64_SIZE+1];
2161 int wantserver_aeslevel = 0;
2163 // if we have a stored host key for the server, assume serverid to already be selected!
2164 // (the loop will refuse to overwrite this one then)
2165 wantserver_idfp[0] = 0;
2166 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, wantserver_idfp, sizeof(wantserver_idfp), &wantserver_aeslevel);
2167 // requirement: wantserver_idfp is a full ID if wantserverid set
2169 // if we leave, we have to consider the connection
2170 // unauthenticated; NOTE: this may be faked by a clever
2171 // attacker to force an unauthenticated connection; so we have
2172 // a safeguard check in place when encryption is required too
2173 // in place, or when authentication is required by the server
2174 crypto->authenticated = false;
2176 GetUntilNul(&data_in, &len_in);
2178 return (wantserverid >= 0) ? Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present") :
2179 (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) :
2182 // FTEQW extension protocol
2185 k = Crypto_LittleLong(data_in);
2186 v = Crypto_LittleLong(data_in + 4);
2194 k = Crypto_LittleLong(data_in);
2199 case PROTOCOL_D0_BLIND_ID:
2200 vlen_blind_id_ptr = data_in;
2201 len_blind_id_ptr = v;
2213 if(!vlen_blind_id_ptr)
2214 return (wantserverid >= 0) ? Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though authentication is required") :
2215 (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) :
2218 data_in = vlen_blind_id_ptr;
2219 len_in = len_blind_id_ptr;
2221 // parse fingerprints
2222 // once we found a fingerprint we can auth to (ANY), select it as clientfp
2223 // once we found a fingerprint in the first list that we know, select it as serverfp
2227 p = GetUntilNul(&data_in, &len_in);
2232 if(!server_can_auth)
2233 break; // other protocol message may follow
2234 server_can_auth = false;
2239 for(i = 0; i < MAX_PUBKEYS; ++i)
2242 if(!strcmp(p, pubkeys_fp64[i]))
2244 if(pubkeys_havepriv[i])
2249 if(wantserverid < 0 || i == wantserverid)
2253 if(clientid >= 0 && serverid >= 0)
2257 // if stored host key is not found:
2258 if(wantserverid >= 0 && serverid < 0)
2259 return Crypto_ClientError(data_out, len_out, "Server CA does not match stored host key, refusing to connect");
2261 if(serverid >= 0 || clientid >= 0)
2263 // TODO at this point, fill clientside crypto struct!
2265 CDATA->cdata_id = ++cdata_id;
2266 CDATA->s = serverid;
2267 CDATA->c = clientid;
2268 memset(crypto->dhkey, 0, sizeof(crypto->dhkey));
2269 strlcpy(CDATA->challenge, challenge, sizeof(CDATA->challenge));
2270 crypto->client_keyfp[0] = 0;
2271 crypto->client_idfp[0] = 0;
2272 crypto->server_keyfp[0] = 0;
2273 crypto->server_idfp[0] = 0;
2274 memcpy(CDATA->wantserver_idfp, wantserver_idfp, sizeof(crypto->server_idfp));
2276 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2277 switch(bound(0, d0_rijndael_dll ? crypto_aeslevel.integer : 0, 3))
2279 default: // dummy, never happens, but to make gcc happy...
2281 if(wantserver_aeslevel >= 3)
2282 return Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL);
2283 CDATA->wantserver_aes = false;
2286 CDATA->wantserver_aes = (wantserver_aeslevel >= 2);
2289 CDATA->wantserver_aes = (wantserver_aeslevel >= 1);
2292 if(wantserver_aeslevel <= 0)
2293 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);
2294 CDATA->wantserver_aes = true;
2298 // build outgoing message
2299 // append regular stuff
2300 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));
2301 PutWithNul(&data_out_p, len_out, serverid >= 0 ? pubkeys_fp64[serverid] : "");
2302 PutWithNul(&data_out_p, len_out, clientid >= 0 ? pubkeys_fp64[clientid] : "");
2306 // I am the client, and my key is ok... so let's set client_keyfp and client_idfp
2307 strlcpy(crypto->client_keyfp, pubkeys_fp64[CDATA->c], sizeof(crypto->client_keyfp));
2308 strlcpy(crypto->client_idfp, pubkeys_priv_fp64[CDATA->c], sizeof(crypto->client_idfp));
2314 CDATA->id = qd0_blind_id_new();
2318 return Crypto_ClientError(data_out, len_out, "d0_blind_id_new failed");
2320 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->s]))
2323 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2325 CDATA->next_step = 1;
2326 *len_out = data_out_p - data_out;
2328 else if(clientid >= 0)
2330 // skip over server auth, perform client auth only
2332 CDATA->id = qd0_blind_id_new();
2336 return Crypto_ClientError(data_out, len_out, "d0_blind_id_new failed");
2338 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
2341 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2343 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
2346 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed");
2348 CDATA->next_step = 5;
2349 data_out_p += *len_out;
2350 *len_out = data_out_p - data_out;
2353 *len_out = data_out_p - data_out;
2355 return CRYPTO_DISCARD;
2359 if(wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2360 if(wantserver_aeslevel >= 3)
2361 return Crypto_ClientError(data_out, len_out, "Server insists on encryption, but neither can authenticate to the other");
2362 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) :
2366 else if(len_in > 5 && !memcmp(string, "d0pk\\", 5) && cls.connect_trying)
2370 cnt = InfoString_GetValue(string + 4, "id", infostringvalue, sizeof(infostringvalue));
2371 id = (cnt ? atoi(cnt) : -1);
2372 cnt = InfoString_GetValue(string + 4, "cnt", infostringvalue, sizeof(infostringvalue));
2374 return Crypto_ClientError(data_out, len_out, "d0pk\\ message without cnt");
2375 GetUntilNul(&data_in, &len_in);
2377 return Crypto_ClientError(data_out, len_out, "d0pk\\ message without attachment");
2379 if(!strcmp(cnt, "1"))
2382 if(CDATA->cdata_id != id)
2383 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2384 if(CDATA->next_step != 1)
2385 return Crypto_SoftClientError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2387 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2389 if((s = InfoString_GetValue(string + 4, "aes", infostringvalue, sizeof(infostringvalue))))
2393 // we CANNOT toggle the AES status any more!
2394 // as the server already decided
2395 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2396 if(!aes && CDATA->wantserver_aes)
2399 return Crypto_ClientError(data_out, len_out, "Stored host key requires encryption, but server did not enable encryption");
2401 if(aes && (!d0_rijndael_dll || crypto_aeslevel.integer <= 0))
2404 return Crypto_ClientError(data_out, len_out, "Server insists on encryption too hard");
2406 if(!aes && (d0_rijndael_dll && crypto_aeslevel.integer >= 3))
2409 return Crypto_ClientError(data_out, len_out, "Server insists on plaintext too hard");
2411 crypto->use_aes = aes != 0;
2413 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\2\\id\\%d", CDATA->cdata_id));
2414 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
2417 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed");
2419 CDATA->next_step = 3;
2420 data_out_p += *len_out;
2421 *len_out = data_out_p - data_out;
2422 return CRYPTO_DISCARD;
2424 else if(!strcmp(cnt, "3"))
2426 static char msgbuf[32];
2427 size_t msgbuflen = sizeof(msgbuf);
2431 if(CDATA->cdata_id != id)
2432 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2433 if(CDATA->next_step != 3)
2434 return Crypto_SoftClientError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2436 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2438 if(!qd0_blind_id_authenticate_with_private_id_verify(CDATA->id, data_in, len_in, msgbuf, &msgbuflen, &status))
2441 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_verify failed (server authentication error)");
2444 strlcpy(crypto->server_keyfp, pubkeys_fp64[CDATA->s], sizeof(crypto->server_keyfp));
2446 crypto->server_keyfp[0] = 0;
2447 memset(crypto->server_idfp, 0, sizeof(crypto->server_idfp));
2448 fpbuflen = FP64_SIZE;
2449 if(!qd0_blind_id_fingerprint64_public_id(CDATA->id, crypto->server_idfp, &fpbuflen))
2452 return Crypto_ClientError(data_out, len_out, "d0_blind_id_fingerprint64_public_id failed");
2454 if(CDATA->wantserver_idfp[0])
2455 if(memcmp(CDATA->wantserver_idfp, crypto->server_idfp, sizeof(crypto->server_idfp)))
2458 return Crypto_ClientError(data_out, len_out, "Server ID does not match stored host key, refusing to connect");
2460 fpbuflen = DHKEY_SIZE;
2461 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) crypto->dhkey, &fpbuflen))
2464 return Crypto_ClientError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed");
2467 // cache the server key
2468 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);
2472 // client will auth next
2473 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\4\\id\\%d", CDATA->cdata_id));
2474 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
2477 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2479 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
2482 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed");
2484 CDATA->next_step = 5;
2485 data_out_p += *len_out;
2486 *len_out = data_out_p - data_out;
2487 return CRYPTO_DISCARD;
2491 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
2492 crypto->authenticated = true;
2493 CDATA->next_step = 0;
2494 // assume we got the empty challenge to finish the protocol
2495 PutWithNul(&data_out_p, len_out, "challenge ");
2496 *len_out = data_out_p - data_out;
2497 --*len_out; // remove NUL terminator
2498 return CRYPTO_REPLACE;
2501 else if(!strcmp(cnt, "5"))
2504 unsigned char dhkey[DHKEY_SIZE];
2508 if(CDATA->cdata_id != id)
2509 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2510 if(CDATA->next_step != 5)
2511 return Crypto_SoftClientError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2513 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2515 if(CDATA->s < 0) // only if server didn't auth
2517 if((s = InfoString_GetValue(string + 4, "aes", infostringvalue, sizeof(infostringvalue))))
2521 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2522 if(!aes && CDATA->wantserver_aes)
2525 return Crypto_ClientError(data_out, len_out, "Stored host key requires encryption, but server did not enable encryption");
2527 if(aes && (!d0_rijndael_dll || crypto_aeslevel.integer <= 0))
2530 return Crypto_ClientError(data_out, len_out, "Server insists on encryption too hard");
2532 if(!aes && (d0_rijndael_dll && crypto_aeslevel.integer >= 3))
2535 return Crypto_ClientError(data_out, len_out, "Server insists on plaintext too hard");
2537 crypto->use_aes = aes != 0;
2540 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\6\\id\\%d", CDATA->cdata_id));
2541 if(!qd0_blind_id_authenticate_with_private_id_response(CDATA->id, data_in, len_in, data_out_p, len_out))
2544 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_response failed");
2546 fpbuflen = DHKEY_SIZE;
2547 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) dhkey, &fpbuflen))
2550 return Crypto_ClientError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed");
2552 // XOR the two DH keys together to make one
2553 for(i = 0; i < DHKEY_SIZE; ++i)
2554 crypto->dhkey[i] ^= dhkey[i];
2555 // session key is FINISHED! By this, all keys are set up
2556 crypto->authenticated = true;
2557 CDATA->next_step = 0;
2558 data_out_p += *len_out;
2559 *len_out = data_out_p - data_out;
2560 return CRYPTO_DISCARD;
2562 return Crypto_SoftClientError(data_out, len_out, "Got unknown d0_blind_id message from server");
2565 return CRYPTO_NOMATCH;
2568 size_t Crypto_SignData(const void *data, size_t datasize, int keyid, void *signed_data, size_t signed_size)
2570 if(keyid < 0 || keyid >= MAX_PUBKEYS)
2572 if(!pubkeys_havepriv[keyid])
2574 if(qd0_blind_id_sign_with_private_id_sign(pubkeys[keyid], true, false, (const char *)data, datasize, (char *)signed_data, &signed_size))
2579 size_t Crypto_SignDataDetached(const void *data, size_t datasize, int keyid, void *signed_data, size_t signed_size)
2581 if(keyid < 0 || keyid >= MAX_PUBKEYS)
2583 if(!pubkeys_havepriv[keyid])
2585 if(qd0_blind_id_sign_with_private_id_sign_detached(pubkeys[keyid], true, false, (const char *)data, datasize, (char *)signed_data, &signed_size))