X-Git-Url: http://git.xonotic.org/?a=blobdiff_plain;f=crypto.c;h=79489532947c073eda3aa86e71c494db88825a85;hb=8367a30715017e7a497f6baf65dbaff5f72d6cf3;hp=40f905068af017b7941319d6d25b46126f3dfe98;hpb=8193aef0fa1ef23f4d98909475fdb473a22eda29;p=xonotic%2Fdarkplaces.git diff --git a/crypto.c b/crypto.c index 40f90506..79489532 100644 --- a/crypto.c +++ b/crypto.c @@ -1,4 +1,3 @@ -// TODO key loading, generating, saving #include "quakedef.h" #include "crypto.h" #include "common.h" @@ -91,7 +90,7 @@ static size_t Crypto_UnParsePack(char *buf, size_t len, unsigned long header, co { if(pos + 4 + lumpsize[i] > len) return 0; - Crypto_UnLittleLong(&buf[pos], lumpsize[i]); + Crypto_UnLittleLong(&buf[pos], (unsigned long)lumpsize[i]); pos += 4; memcpy(&buf[pos], lumps[i], lumpsize[i]); pos += lumpsize[i]; @@ -102,7 +101,7 @@ static size_t Crypto_UnParsePack(char *buf, size_t len, unsigned long header, co #define USE_AES -#ifdef CRYPTO_STATIC +#ifdef LINK_TO_CRYPTO #include @@ -147,8 +146,8 @@ static size_t Crypto_UnParsePack(char *buf, size_t len, unsigned long header, co #define qd0_blind_id_sign_with_private_id_sign_detached d0_blind_id_sign_with_private_id_sign_detached #define qd0_blind_id_setmallocfuncs d0_blind_id_setmallocfuncs #define qd0_blind_id_setmutexfuncs d0_blind_id_setmutexfuncs -#define qd0_blind_id_verify_public_id d0_bind_id_verify_public_id -#define qd0_blind_id_verify_private_id d0_bind_id_verify_private_id +#define qd0_blind_id_verify_public_id d0_blind_id_verify_public_id +#define qd0_blind_id_verify_private_id d0_blind_id_verify_private_id #else @@ -285,7 +284,7 @@ static void Crypto_CloseLibrary (void) #endif -#ifdef CRYPTO_RIJNDAEL_STATIC +#ifdef LINK_TO_CRYPTO_RIJNDAEL #include @@ -413,17 +412,12 @@ static const char *GetUntilNul(const char **data, size_t *len) *len = 0; return NULL; } - else - { - n = (p - *data) + 1; - *len -= n; - *data += n; - if(*len == 0) - *data = NULL; - return (const char *) data_save; - } - *data = NULL; - return NULL; + n = (p - *data) + 1; + *len -= n; + *data += n; + if(*len == 0) + *data = NULL; + return (const char *) data_save; } // d0pk reading @@ -495,6 +489,7 @@ typedef struct char challenge[2048]; char wantserver_idfp[FP64_SIZE+1]; qboolean wantserver_aes; + qboolean wantserver_issigned; int cdata_id; } crypto_data_t; @@ -534,7 +529,7 @@ static crypto_t *Crypto_ServerFindInstance(lhnetaddress_t *peeraddress, qboolean return crypto; } -qboolean Crypto_ServerFinishInstance(crypto_t *out, crypto_t *crypto) +qboolean Crypto_FinishInstance(crypto_t *out, crypto_t *crypto) { // no check needed here (returned pointers are only used in prefilled fields) if(!crypto || !crypto->authenticated) @@ -545,7 +540,7 @@ qboolean Crypto_ServerFinishInstance(crypto_t *out, crypto_t *crypto) } CLEAR_CDATA; memcpy(out, crypto, sizeof(*out)); - memset(crypto, 0, sizeof(crypto)); + memset(crypto, 0, sizeof(*crypto)); return true; } @@ -562,6 +557,7 @@ typedef struct crypto_storedhostkey_s int keyid; char idfp[FP64_SIZE+1]; int aeslevel; + qboolean issigned; } crypto_storedhostkey_t; static crypto_storedhostkey_t *crypto_storedhostkey_hashtable[CRYPTO_HOSTKEY_HASHSIZE]; @@ -618,6 +614,7 @@ static void Crypto_StoreHostKey(lhnetaddress_t *peeraddress, const char *keystri int keyid; char idfp[FP64_SIZE+1]; int aeslevel; + qboolean issigned; if(!d0_blind_id_dll) return; @@ -632,10 +629,12 @@ static void Crypto_StoreHostKey(lhnetaddress_t *peeraddress, const char *keystri ++keystring; keyid = -1; + issigned = false; while(*keystring && keyid < 0) { // id@key const char *idstart, *idend, *keystart, *keyend; + qboolean thisissigned = true; ++keystring; // skip the space idstart = keystring; while(*keystring && *keystring != ' ' && *keystring != '@') @@ -649,18 +648,26 @@ static void Crypto_StoreHostKey(lhnetaddress_t *peeraddress, const char *keystri ++keystring; keyend = keystring; + if (keystart[0] == '~') + { + thisissigned = false; + ++keystart; + } + if(idend - idstart == FP64_SIZE && keyend - keystart == FP64_SIZE) { - for(keyid = 0; keyid < MAX_PUBKEYS; ++keyid) - if(pubkeys[keyid]) - if(!memcmp(pubkeys_fp64[keyid], keystart, FP64_SIZE)) + int thiskeyid; + for(thiskeyid = MAX_PUBKEYS - 1; thiskeyid >= 0; --thiskeyid) + if(pubkeys[thiskeyid]) + if(!memcmp(pubkeys_fp64[thiskeyid], keystart, FP64_SIZE)) { memcpy(idfp, idstart, FP64_SIZE); idfp[FP64_SIZE] = 0; + keyid = thiskeyid; + issigned = thisissigned; break; } - if(keyid >= MAX_PUBKEYS) - keyid = -1; + // If this failed, keyid will be -1. } } @@ -679,8 +686,11 @@ static void Crypto_StoreHostKey(lhnetaddress_t *peeraddress, const char *keystri 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); if(hk->aeslevel > aeslevel) 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); + if(hk->issigned > issigned) + Con_Printf("Server %s tried to reduce signature status, not accepted. Connecting to it will fail. To accept, do crypto_hostkey_clear %s\n", buf, buf); } hk->aeslevel = max(aeslevel, hk->aeslevel); + hk->issigned = issigned; return; } @@ -691,10 +701,11 @@ static void Crypto_StoreHostKey(lhnetaddress_t *peeraddress, const char *keystri memcpy(hk->idfp, idfp, FP64_SIZE+1); hk->next = crypto_storedhostkey_hashtable[hashindex]; hk->aeslevel = aeslevel; + hk->issigned = issigned; crypto_storedhostkey_hashtable[hashindex] = hk; } -qboolean Crypto_RetrieveHostKey(lhnetaddress_t *peeraddress, int *keyid, char *keyfp, size_t keyfplen, char *idfp, size_t idfplen, int *aeslevel) +qboolean Crypto_RetrieveHostKey(lhnetaddress_t *peeraddress, int *keyid, char *keyfp, size_t keyfplen, char *idfp, size_t idfplen, int *aeslevel, qboolean *issigned) { char buf[128]; int hashindex; @@ -718,6 +729,8 @@ qboolean Crypto_RetrieveHostKey(lhnetaddress_t *peeraddress, int *keyid, char *k strlcpy(idfp, hk->idfp, idfplen); if(aeslevel) *aeslevel = hk->aeslevel; + if(issigned) + *issigned = hk->issigned; return true; } @@ -735,7 +748,7 @@ int Crypto_RetrieveLocalKey(int keyid, char *keyfp, size_t keyfplen, char *idfp, strlcpy(keyfp, pubkeys_fp64[keyid], keyfplen); if(idfp) if(pubkeys_havepriv[keyid]) - strlcpy(idfp, pubkeys_priv_fp64[keyid], keyfplen); + strlcpy(idfp, pubkeys_priv_fp64[keyid], idfplen); if(issigned) *issigned = pubkeys_havesig[keyid]; return 1; @@ -772,6 +785,47 @@ static void Crypto_BuildChallengeAppend(void) challenge_append_length = p - challenge_append; } +static qboolean Crypto_SavePubKeyTextFile(int i) +{ + qfile_t *f; + char vabuf[1024]; + + if(!pubkeys_havepriv[i]) + return false; + f = FS_SysOpen(va(vabuf, sizeof(vabuf), "%skey_%d-public-fp%s.txt", *fs_userdir ? fs_userdir : fs_basedir, i, sessionid.string), "w", false); + if(!f) + return false; + + // we ignore errors for this file, as it's not necessary to have + FS_Printf(f, "ID-Fingerprint: %s\n", pubkeys_priv_fp64[i]); + FS_Printf(f, "ID-Is-Signed: %s\n", pubkeys_havesig[i] ? "yes" : "no"); + FS_Printf(f, "ID-Is-For-Key: %s\n", pubkeys_fp64[i]); + FS_Printf(f, "\n"); + FS_Printf(f, "This is a PUBLIC ID file for DarkPlaces.\n"); + FS_Printf(f, "You are free to share this file or its contents.\n"); + FS_Printf(f, "\n"); + FS_Printf(f, "This file will be automatically generated again if deleted.\n"); + FS_Printf(f, "\n"); + FS_Printf(f, "However, NEVER share the accompanying SECRET ID file called\n"); + FS_Printf(f, "key_%d.d0si%s, as doing so would compromise security!\n", i, sessionid.string); + FS_Close(f); + + return true; +} + +static void Crypto_BuildIdString(void) +{ + int i; + char vabuf[1024]; + + crypto_idstring = NULL; + dpsnprintf(crypto_idstring_buf, sizeof(crypto_idstring_buf), "%d", d0_rijndael_dll ? crypto_aeslevel.integer : 0); + for (i = 0; i < MAX_PUBKEYS; ++i) + if (pubkeys[i]) + strlcat(crypto_idstring_buf, va(vabuf, sizeof(vabuf), " %s@%s%s", pubkeys_priv_fp64[i], pubkeys_havesig[i] ? "" : "~", pubkeys_fp64[i]), sizeof(crypto_idstring_buf)); + crypto_idstring = crypto_idstring_buf; +} + void Crypto_LoadKeys(void) { char buf[8192]; @@ -793,8 +847,6 @@ void Crypto_LoadKeys(void) // PUBLIC KEYS to accept (including modulus) // PRIVATE KEY of user - crypto_idstring = NULL; - dpsnprintf(crypto_idstring_buf, sizeof(crypto_idstring_buf), "%d", d0_rijndael_dll ? crypto_aeslevel.integer : 0); for(i = 0; i < MAX_PUBKEYS; ++i) { memset(pubkeys_fp64[i], 0, sizeof(pubkeys_fp64[i])); @@ -824,13 +876,13 @@ void Crypto_LoadKeys(void) if(qd0_blind_id_verify_private_id(pubkeys[i]) && qd0_blind_id_verify_public_id(pubkeys[i], &status)) { pubkeys_havepriv[i] = true; - strlcat(crypto_idstring_buf, va(vabuf, sizeof(vabuf), " %s@%s", pubkeys_priv_fp64[i], pubkeys_fp64[i]), sizeof(crypto_idstring_buf)); + pubkeys_havesig[i] = status; // verify the key we just got (just in case) - if(status) - pubkeys_havesig[i] = true; - else + if(!status) Con_Printf("NOTE: this ID has not yet been signed!\n"); + + Crypto_SavePubKeyTextFile(i); } else { @@ -856,9 +908,9 @@ void Crypto_LoadKeys(void) } } } - crypto_idstring = crypto_idstring_buf; keygen_i = -1; + Crypto_BuildIdString(); Crypto_BuildChallengeAppend(); // find a good prefix length for all the keys we know (yes, algorithm is not perfect yet, may yield too long prefix length) @@ -1010,7 +1062,7 @@ void Crypto_Init(void) return; } - Crypto_Rijndael_OpenLibrary(); // if this fails, it's uncritical + (void) Crypto_Rijndael_OpenLibrary(); // if this fails, it's uncritical Crypto_InitHostKeys(); } @@ -1045,17 +1097,17 @@ static void Crypto_KeyGen_Finished(int code, size_t length_received, unsigned ch return; } - if(keygen_i >= MAX_PUBKEYS || !pubkeys[keygen_i]) + if(keygen_i < 0) { - Con_Printf("overflow of keygen_i\n"); - keygen_i = -1; + Con_Printf("Unexpected response from keygen server:\n"); + Com_HexDumpToConsole(buffer, (int)length_received); SV_UnlockThreadMutex(); return; } - if(keygen_i < 0) + if(keygen_i >= MAX_PUBKEYS || !pubkeys[keygen_i]) { - Con_Printf("Unexpected response from keygen server:\n"); - Com_HexDumpToConsole(buffer, length_received); + Con_Printf("overflow of keygen_i\n"); + keygen_i = -1; SV_UnlockThreadMutex(); return; } @@ -1068,7 +1120,7 @@ static void Crypto_KeyGen_Finished(int code, size_t length_received, unsigned ch else { Con_Printf("Invalid response from keygen server:\n"); - Com_HexDumpToConsole(buffer, length_received); + Com_HexDumpToConsole(buffer, (int)length_received); } keygen_i = -1; SV_UnlockThreadMutex(); @@ -1126,7 +1178,12 @@ static void Crypto_KeyGen_Finished(int code, size_t length_received, unsigned ch FS_Write(f, buf2, buf2size); FS_Close(f); + Crypto_SavePubKeyTextFile(keygen_i); + Con_Printf("Saved to key_%d.d0si%s\n", keygen_i, sessionid.string); + + Crypto_BuildIdString(); + keygen_i = -1; SV_UnlockThreadMutex(); } @@ -1243,6 +1300,8 @@ static void Crypto_KeyGen_f(void) FS_Write(f, buf2, buf2size); FS_Close(f); + Crypto_SavePubKeyTextFile(keygen_i); + Con_Printf("Saved unsigned key to key_%d.d0si%s\n", keygen_i, sessionid.string); } p[0] = buf; @@ -1271,7 +1330,7 @@ static void Crypto_KeyGen_f(void) return; } buf2l += buf2pos; - buf[buf2l] = 0; + buf2[buf2l] = 0; if(!Curl_Begin_ToMemory(buf2, 0, (unsigned char *) keygen_buf, sizeof(keygen_buf), Crypto_KeyGen_Finished, NULL)) { Con_Printf("curl failed\n"); @@ -1452,15 +1511,15 @@ const void *Crypto_EncryptPacket(crypto_t *crypto, const void *data_src, size_t if(developer_networking.integer) { Con_Print("To be encrypted:\n"); - Com_HexDumpToConsole((const unsigned char *) data_src, len_src); + Com_HexDumpToConsole((const unsigned char *) data_src, (int)len_src); } - if(len_src + 32 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, len_src, crypto->dhkey, DHKEY_SIZE)) + if(len_src + 32 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, (int)len_src, crypto->dhkey, DHKEY_SIZE)) { Con_Printf("Crypto_EncryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len); return NULL; } *len_dst = ((len_src + 15) / 16) * 16 + 16; // add 16 for HMAC, then round to 16-size for AES - ((unsigned char *) data_dst)[0] = *len_dst - len_src; + ((unsigned char *) data_dst)[0] = (unsigned char)(*len_dst - len_src); memcpy(((unsigned char *) data_dst)+1, h, 15); aescpy(crypto->dhkey, (const unsigned char *) data_dst, ((unsigned char *) data_dst) + 16, (const unsigned char *) data_src, len_src); // IV dst src len @@ -1468,7 +1527,7 @@ const void *Crypto_EncryptPacket(crypto_t *crypto, const void *data_src, size_t else { // HMAC packet = 16 bytes HMAC-SHA-256 (truncated to 128 bits), data - if(len_src + 16 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, len_src, crypto->dhkey, DHKEY_SIZE)) + if(len_src + 16 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, (int)len_src, crypto->dhkey, DHKEY_SIZE)) { Con_Printf("Crypto_EncryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len); return NULL; @@ -1526,7 +1585,7 @@ const void *Crypto_DecryptPacket(crypto_t *crypto, const void *data_src, size_t } seacpy(crypto->dhkey, (unsigned char *) data_src, (unsigned char *) data_dst, ((const unsigned char *) data_src) + 16, *len_dst); // IV dst src len - if(!HMAC_SHA256_32BYTES(h, (const unsigned char *) data_dst, *len_dst, crypto->dhkey, DHKEY_SIZE)) + if(!HMAC_SHA256_32BYTES(h, (const unsigned char *) data_dst, (int)*len_dst, crypto->dhkey, DHKEY_SIZE)) { Con_Printf("HMAC fail\n"); return NULL; @@ -1539,7 +1598,7 @@ const void *Crypto_DecryptPacket(crypto_t *crypto, const void *data_src, size_t if(developer_networking.integer) { Con_Print("Decrypted:\n"); - Com_HexDumpToConsole((const unsigned char *) data_dst, *len_dst); + Com_HexDumpToConsole((const unsigned char *) data_dst, (int)*len_dst); } return data_dst; // no need to copy } @@ -1557,10 +1616,10 @@ const void *Crypto_DecryptPacket(crypto_t *crypto, const void *data_src, size_t return NULL; } //memcpy(data_dst, data_src + 16, *len_dst); - if(!HMAC_SHA256_32BYTES(h, ((const unsigned char *) data_src) + 16, *len_dst, crypto->dhkey, DHKEY_SIZE)) + if(!HMAC_SHA256_32BYTES(h, ((const unsigned char *) data_src) + 16, (int)*len_dst, crypto->dhkey, DHKEY_SIZE)) { Con_Printf("HMAC fail\n"); - Com_HexDumpToConsole((const unsigned char *) data_src, len_src); + Com_HexDumpToConsole((const unsigned char *) data_src, (int)len_src); return NULL; } @@ -1578,14 +1637,14 @@ const void *Crypto_DecryptPacket(crypto_t *crypto, const void *data_src, size_t if(memcmp((const unsigned char *) data_src, h, 16)) // ignore first byte, used for length { Con_Printf("HMAC mismatch\n"); - Com_HexDumpToConsole((const unsigned char *) data_src, len_src); + Com_HexDumpToConsole((const unsigned char *) data_src, (int)len_src); return NULL; } } else { Con_Printf("HMAC mismatch\n"); - Com_HexDumpToConsole((const unsigned char *) data_src, len_src); + Com_HexDumpToConsole((const unsigned char *) data_src, (int)len_src); return NULL; } } @@ -1729,13 +1788,13 @@ static int Crypto_ServerParsePacket_Internal(const char *data_in, size_t len_in, p = GetUntilNul(&data_in, &len_in); if(p && *p) { + // Find the highest numbered matching key for p. for(i = 0; i < MAX_PUBKEYS; ++i) { if(pubkeys[i]) if(!strcmp(p, pubkeys_fp64[i])) if(pubkeys_havepriv[i]) - if(serverid < 0) - serverid = i; + serverid = i; } if(serverid < 0) return Crypto_ServerError(data_out, len_out, "Invalid server key", NULL); @@ -1743,12 +1802,12 @@ static int Crypto_ServerParsePacket_Internal(const char *data_in, size_t len_in, p = GetUntilNul(&data_in, &len_in); if(p && *p) { + // Find the highest numbered matching key for p. for(i = 0; i < MAX_PUBKEYS; ++i) { if(pubkeys[i]) if(!strcmp(p, pubkeys_fp64[i])) - if(clientid < 0) - clientid = i; + clientid = i; } if(clientid < 0) return Crypto_ServerError(data_out, len_out, "Invalid client key", NULL); @@ -1774,6 +1833,7 @@ static int Crypto_ServerParsePacket_Internal(const char *data_in, size_t len_in, // I am the server, and my key is ok... so let's set server_keyfp and server_idfp strlcpy(crypto->server_keyfp, pubkeys_fp64[CDATA->s], sizeof(crypto->server_keyfp)); strlcpy(crypto->server_idfp, pubkeys_priv_fp64[CDATA->s], sizeof(crypto->server_idfp)); + crypto->server_issigned = pubkeys_havesig[CDATA->s]; if(!CDATA->id) CDATA->id = qd0_blind_id_new(); @@ -1914,10 +1974,9 @@ static int Crypto_ServerParsePacket_Internal(const char *data_in, size_t len_in, CLEAR_CDATA; return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_verify failed (authentication error)", "Authentication error"); } - if(status) - strlcpy(crypto->client_keyfp, pubkeys_fp64[CDATA->c], sizeof(crypto->client_keyfp)); - else - crypto->client_keyfp[0] = 0; + strlcpy(crypto->client_keyfp, pubkeys_fp64[CDATA->c], sizeof(crypto->client_keyfp)); + crypto->client_issigned = status; + memset(crypto->client_idfp, 0, sizeof(crypto->client_idfp)); fpbuflen = FP64_SIZE; if(!qd0_blind_id_fingerprint64_public_id(CDATA->id, crypto->client_idfp, &fpbuflen)) @@ -2040,7 +2099,7 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, if (len_in == 6 && !memcmp(string, "accept", 6) && cls.connect_trying && d0_rijndael_dll) { int wantserverid = -1; - Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL); + Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL, NULL); if(!crypto || !crypto->authenticated) // we ALSO get here if we are using an encrypted connection, so let's rule this out { if(wantserverid >= 0) @@ -2053,7 +2112,7 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, else if (len_in >= 1 && string[0] == 'j' && cls.connect_trying && d0_rijndael_dll) { int wantserverid = -1; - Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL); + Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL, NULL); //if(!crypto || !crypto->authenticated) { if(wantserverid >= 0) @@ -2068,14 +2127,14 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, int wantserverid = -1; // these three are harmless - if(string[4] == CCREP_SERVER_INFO) + if((unsigned char) string[4] == CCREP_SERVER_INFO) return CRYPTO_NOMATCH; - if(string[4] == CCREP_PLAYER_INFO) + if((unsigned char) string[4] == CCREP_PLAYER_INFO) return CRYPTO_NOMATCH; - if(string[4] == CCREP_RULE_INFO) + if((unsigned char) string[4] == CCREP_RULE_INFO) return CRYPTO_NOMATCH; - Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL); + Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL, NULL); //if(!crypto || !crypto->authenticated) { if(wantserverid >= 0) @@ -2123,12 +2182,13 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, int clientid = -1, serverid = -1, wantserverid = -1; qboolean server_can_auth = true; char wantserver_idfp[FP64_SIZE+1]; - int wantserver_aeslevel; + int wantserver_aeslevel = 0; + qboolean wantserver_issigned = false; // if we have a stored host key for the server, assume serverid to already be selected! // (the loop will refuse to overwrite this one then) wantserver_idfp[0] = 0; - Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, wantserver_idfp, sizeof(wantserver_idfp), &wantserver_aeslevel); + Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, wantserver_idfp, sizeof(wantserver_idfp), &wantserver_aeslevel, &wantserver_issigned); // requirement: wantserver_idfp is a full ID if wantserverid set // if we leave, we have to consider the connection @@ -2201,22 +2261,20 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, break; continue; } + // Find the highest numbered matching key for p. for(i = 0; i < MAX_PUBKEYS; ++i) { if(pubkeys[i]) if(!strcmp(p, pubkeys_fp64[i])) { if(pubkeys_havepriv[i]) - if(clientid < 0) - clientid = i; + clientid = i; if(server_can_auth) - if(serverid < 0) - if(wantserverid < 0 || i == wantserverid) - serverid = i; + if(wantserverid < 0 || i == wantserverid) + serverid = i; } } - if(clientid >= 0 && serverid >= 0) - break; + // Not breaking, as higher keys in the list always have priority. } // if stored host key is not found: @@ -2225,7 +2283,6 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, if(serverid >= 0 || clientid >= 0) { - // TODO at this point, fill clientside crypto struct! MAKE_CDATA; CDATA->cdata_id = ++cdata_id; CDATA->s = serverid; @@ -2237,6 +2294,7 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, crypto->server_keyfp[0] = 0; crypto->server_idfp[0] = 0; memcpy(CDATA->wantserver_idfp, wantserver_idfp, sizeof(crypto->server_idfp)); + CDATA->wantserver_issigned = wantserver_issigned; if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting switch(bound(0, d0_rijndael_dll ? crypto_aeslevel.integer : 0, 3)) @@ -2271,6 +2329,7 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, // I am the client, and my key is ok... so let's set client_keyfp and client_idfp strlcpy(crypto->client_keyfp, pubkeys_fp64[CDATA->c], sizeof(crypto->client_keyfp)); strlcpy(crypto->client_idfp, pubkeys_priv_fp64[CDATA->c], sizeof(crypto->client_idfp)); + crypto->client_issigned = pubkeys_havesig[CDATA->c]; } if(serverid >= 0) @@ -2290,7 +2349,7 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, CDATA->next_step = 1; *len_out = data_out_p - data_out; } - else if(clientid >= 0) + else // if(clientid >= 0) // guaranteed by condition one level outside { // skip over server auth, perform client auth only if(!CDATA->id) @@ -2314,8 +2373,6 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, data_out_p += *len_out; *len_out = data_out_p - data_out; } - else - *len_out = data_out_p - data_out; return CRYPTO_DISCARD; } @@ -2405,10 +2462,15 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, CLEAR_CDATA; return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_verify failed (server authentication error)"); } - if(status) - strlcpy(crypto->server_keyfp, pubkeys_fp64[CDATA->s], sizeof(crypto->server_keyfp)); - else - crypto->server_keyfp[0] = 0; + + strlcpy(crypto->server_keyfp, pubkeys_fp64[CDATA->s], sizeof(crypto->server_keyfp)); + if (!status && CDATA->wantserver_issigned) + { + CLEAR_CDATA; + return Crypto_ClientError(data_out, len_out, "Stored host key requires a valid signature, but server did not provide any"); + } + crypto->server_issigned = status; + memset(crypto->server_idfp, 0, sizeof(crypto->server_idfp)); fpbuflen = FP64_SIZE; if(!qd0_blind_id_fingerprint64_public_id(CDATA->id, crypto->server_idfp, &fpbuflen)) @@ -2430,7 +2492,7 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, } // cache the server key - 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); + Crypto_StoreHostKey(&cls.connect_address, va(vabuf, sizeof(vabuf), "%d %s@%s%s", crypto->use_aes ? 1 : 0, crypto->server_idfp, crypto->server_issigned ? "" : "~", pubkeys_fp64[CDATA->s]), false); if(CDATA->c >= 0) {