]> git.xonotic.org Git - xonotic/darkplaces.git/blobdiff - crypto.c
sv_main: Add campaign cvar. Set 1 if not coop or deathmatch (Quake rerelease compatib...
[xonotic/darkplaces.git] / crypto.c
index 79489532947c073eda3aa86e71c494db88825a85..21b70954fc9045e163faf138591ece7bc0828051 100644 (file)
--- a/crypto.c
+++ b/crypto.c
@@ -1,3 +1,24 @@
+/*
+Copyright (C) 2010-2015 Rudolf Polzer (divVerent)
+Copyright (C) 2010-2020 Ashley Rose Hale (LadyHavoc)
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+
 #include "quakedef.h"
 #include "crypto.h"
 #include "common.h"
 #include "hmac.h"
 #include "libcurl.h"
 
-cvar_t crypto_developer = {CVAR_SAVE, "crypto_developer", "0", "print extra info about crypto handshake"};
-cvar_t crypto_servercpupercent = {CVAR_SAVE, "crypto_servercpupercent", "10", "allowed crypto CPU load in percent for server operation (0 = no limit, faster)"};
-cvar_t crypto_servercpumaxtime = {CVAR_SAVE, "crypto_servercpumaxtime", "0.01", "maximum allowed crypto CPU time per frame (0 = no limit)"};
-cvar_t crypto_servercpudebug = {CVAR_SAVE, "crypto_servercpudebug", "0", "print statistics about time usage by crypto"};
+cvar_t crypto_developer = {CF_CLIENT | CF_SERVER | CF_ARCHIVE, "crypto_developer", "0", "print extra info about crypto handshake"};
+cvar_t crypto_aeslevel = {CF_CLIENT | CF_SERVER | CF_ARCHIVE, "crypto_aeslevel", "1", "whether to support AES encryption in authenticated connections (0 = no, 1 = supported, 2 = requested, 3 = required)"};
+
+cvar_t crypto_servercpupercent = {CF_CLIENT | CF_SERVER | CF_ARCHIVE, "crypto_servercpupercent", "10", "allowed crypto CPU load in percent for server operation (0 = no limit, faster)"};
+cvar_t crypto_servercpumaxtime = {CF_CLIENT | CF_SERVER | CF_ARCHIVE, "crypto_servercpumaxtime", "0.01", "maximum allowed crypto CPU time per frame (0 = no limit)"};
+cvar_t crypto_servercpudebug = {CF_CLIENT | CF_SERVER | CF_ARCHIVE, "crypto_servercpudebug", "0", "print statistics about time usage by crypto"};
 static double crypto_servercpu_accumulator = 0;
 static double crypto_servercpu_lastrealtime = 0;
-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)"};
+
+extern cvar_t net_sourceaddresscheck;
+
 int crypto_keyfp_recommended_length;
 static const char *crypto_idstring = NULL;
 static char crypto_idstring_buf[512];
 
+
 #define PROTOCOL_D0_BLIND_ID FOURCC_D0PK
 #define PROTOCOL_VLEN (('v' << 0) | ('l' << 8) | ('e' << 16) | ('n' << 24))
 
@@ -153,7 +179,7 @@ static size_t Crypto_UnParsePack(char *buf, size_t len, unsigned long header, co
 
 // d0_blind_id interface
 #define D0_EXPORT
-#ifdef __GNUC__
+#if defined (__GNUC__) || (__clang__) || (__TINYC__)
 #define D0_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
 #else
 #define D0_WARN_UNUSED_RESULT
@@ -254,7 +280,7 @@ static dllfunction_t d0_blind_id_funcs[] =
 // end of d0_blind_id interface
 
 static dllhandle_t d0_blind_id_dll = NULL;
-static qboolean Crypto_OpenLibrary (void)
+static qbool Crypto_OpenLibrary (void)
 {
        const char* dllnames [] =
        {
@@ -274,12 +300,12 @@ static qboolean Crypto_OpenLibrary (void)
                return true;
 
        // Load the DLL
-       return Sys_LoadLibrary (dllnames, &d0_blind_id_dll, d0_blind_id_funcs);
+       return Sys_LoadDependency (dllnames, &d0_blind_id_dll, d0_blind_id_funcs);
 }
 
 static void Crypto_CloseLibrary (void)
 {
-       Sys_UnloadLibrary (&d0_blind_id_dll);
+       Sys_FreeLibrary (&d0_blind_id_dll);
 }
 
 #endif
@@ -323,7 +349,7 @@ static dllfunction_t d0_rijndael_funcs[] =
 // end of d0_blind_id interface
 
 static dllhandle_t d0_rijndael_dll = NULL;
-static qboolean Crypto_Rijndael_OpenLibrary (void)
+static qbool Crypto_Rijndael_OpenLibrary (void)
 {
        const char* dllnames [] =
        {
@@ -343,12 +369,12 @@ static qboolean Crypto_Rijndael_OpenLibrary (void)
                return true;
 
        // Load the DLL
-       return Sys_LoadLibrary (dllnames, &d0_rijndael_dll, d0_rijndael_funcs);
+       return Sys_LoadDependency (dllnames, &d0_rijndael_dll, d0_rijndael_funcs);
 }
 
 static void Crypto_Rijndael_CloseLibrary (void)
 {
-       Sys_UnloadLibrary (&d0_rijndael_dll);
+       Sys_FreeLibrary (&d0_rijndael_dll);
 }
 
 #endif
@@ -359,7 +385,7 @@ void sha256(unsigned char *out, const unsigned char *in, int n)
        qd0_blind_id_util_sha256((char *) out, (const char *) in, n);
 }
 
-static size_t Crypto_LoadFile(const char *path, char *buf, size_t nmax, qboolean inuserdir)
+static size_t Crypto_LoadFile(const char *path, char *buf, size_t nmax, qbool inuserdir)
 {
        char vabuf[1024];
        qfile_t *f = NULL;
@@ -377,7 +403,7 @@ static size_t Crypto_LoadFile(const char *path, char *buf, size_t nmax, qboolean
        return (size_t) n;
 }
 
-static qboolean PutWithNul(char **data, size_t *len, const char *str)
+static qbool PutWithNul(char **data, size_t *len, const char *str)
 {
        // invariant: data points to insertion point
        size_t l = strlen(str);
@@ -440,7 +466,7 @@ static d0_blind_id_t *Crypto_ReadPublicKey(char *buf, size_t len)
 }
 
 // d0si reading
-static qboolean Crypto_AddPrivateKey(d0_blind_id_t *pk, char *buf, size_t len)
+static qbool Crypto_AddPrivateKey(d0_blind_id_t *pk, char *buf, size_t len)
 {
        const char *p[1];
        size_t l[1];
@@ -455,8 +481,8 @@ static qboolean Crypto_AddPrivateKey(d0_blind_id_t *pk, char *buf, size_t len)
 #define MAX_PUBKEYS 16
 static d0_blind_id_t *pubkeys[MAX_PUBKEYS];
 static char pubkeys_fp64[MAX_PUBKEYS][FP64_SIZE+1];
-static qboolean pubkeys_havepriv[MAX_PUBKEYS];
-static qboolean pubkeys_havesig[MAX_PUBKEYS];
+static qbool pubkeys_havepriv[MAX_PUBKEYS];
+static qbool pubkeys_havesig[MAX_PUBKEYS];
 static char pubkeys_priv_fp64[MAX_PUBKEYS][FP64_SIZE+1];
 static char challenge_append[1400];
 static size_t challenge_append_length;
@@ -488,8 +514,8 @@ typedef struct
        int next_step;
        char challenge[2048];
        char wantserver_idfp[FP64_SIZE+1];
-       qboolean wantserver_aes;
-       qboolean wantserver_issigned;
+       qbool wantserver_aes;
+       qbool wantserver_issigned;
        int cdata_id;
 }
 crypto_data_t;
@@ -499,7 +525,7 @@ crypto_data_t;
 #define MAKE_CDATA if(!crypto->data) crypto->data = Z_Malloc(sizeof(crypto_data_t))
 #define CLEAR_CDATA if(crypto->data) { if(CDATA->id) qd0_blind_id_free(CDATA->id); Z_Free(crypto->data); } crypto->data = NULL
 
-static crypto_t *Crypto_ServerFindInstance(lhnetaddress_t *peeraddress, qboolean allow_create)
+static crypto_t *Crypto_ServerFindInstance(lhnetaddress_t *peeraddress, qbool allow_create)
 {
        crypto_t *crypto; 
        int i, best;
@@ -513,7 +539,7 @@ static crypto_t *Crypto_ServerFindInstance(lhnetaddress_t *peeraddress, qboolean
        if(i < MAX_CRYPTOCONNECTS && (allow_create || cryptoconnects[i].crypto.data))
        {
                crypto = &cryptoconnects[i].crypto;
-               cryptoconnects[i].lasttime = realtime;
+               cryptoconnects[i].lasttime = host.realtime;
                return crypto;
        }
        if(!allow_create)
@@ -523,13 +549,13 @@ static crypto_t *Crypto_ServerFindInstance(lhnetaddress_t *peeraddress, qboolean
                if(cryptoconnects[i].lasttime < cryptoconnects[best].lasttime)
                        best = i;
        crypto = &cryptoconnects[best].crypto;
-       cryptoconnects[best].lasttime = realtime;
+       cryptoconnects[best].lasttime = host.realtime;
        memcpy(&cryptoconnects[best].address, peeraddress, sizeof(cryptoconnects[best].address));
        CLEAR_CDATA;
        return crypto;
 }
 
-qboolean Crypto_FinishInstance(crypto_t *out, crypto_t *crypto)
+qbool Crypto_FinishInstance(crypto_t *out, crypto_t *crypto)
 {
        // no check needed here (returned pointers are only used in prefilled fields)
        if(!crypto || !crypto->authenticated)
@@ -557,7 +583,7 @@ typedef struct crypto_storedhostkey_s
        int keyid;
        char idfp[FP64_SIZE+1];
        int aeslevel;
-       qboolean issigned;
+       qbool issigned;
 }
 crypto_storedhostkey_t;
 static crypto_storedhostkey_t *crypto_storedhostkey_hashtable[CRYPTO_HOSTKEY_HASHSIZE];
@@ -584,12 +610,12 @@ static void Crypto_ClearHostKeys(void)
        }
 }
 
-static qboolean Crypto_ClearHostKey(lhnetaddress_t *peeraddress)
+static qbool Crypto_ClearHostKey(lhnetaddress_t *peeraddress)
 {
        char buf[128];
        int hashindex;
        crypto_storedhostkey_t **hkp;
-       qboolean found = false;
+       qbool found = false;
 
        LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
        hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
@@ -606,7 +632,7 @@ static qboolean Crypto_ClearHostKey(lhnetaddress_t *peeraddress)
        return found;
 }
 
-static void Crypto_StoreHostKey(lhnetaddress_t *peeraddress, const char *keystring, qboolean complain)
+static void Crypto_StoreHostKey(lhnetaddress_t *peeraddress, const char *keystring, qbool complain)
 {
        char buf[128];
        int hashindex;
@@ -614,7 +640,7 @@ static void Crypto_StoreHostKey(lhnetaddress_t *peeraddress, const char *keystri
        int keyid;
        char idfp[FP64_SIZE+1];
        int aeslevel;
-       qboolean issigned;
+       qbool issigned;
 
        if(!d0_blind_id_dll)
                return;
@@ -634,7 +660,7 @@ static void Crypto_StoreHostKey(lhnetaddress_t *peeraddress, const char *keystri
        {
                // id@key
                const char *idstart, *idend, *keystart, *keyend;
-               qboolean thisissigned = true;
+               qbool thisissigned = true;
                ++keystring; // skip the space
                idstart = keystring;
                while(*keystring && *keystring != ' ' && *keystring != '@')
@@ -705,7 +731,7 @@ static void Crypto_StoreHostKey(lhnetaddress_t *peeraddress, const char *keystri
        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 *issigned)
+qbool Crypto_RetrieveHostKey(lhnetaddress_t *peeraddress, int *keyid, char *keyfp, size_t keyfplen, char *idfp, size_t idfplen, int *aeslevel, qbool *issigned)
 {
        char buf[128];
        int hashindex;
@@ -734,7 +760,7 @@ qboolean Crypto_RetrieveHostKey(lhnetaddress_t *peeraddress, int *keyid, char *k
 
        return true;
 }
-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
+int Crypto_RetrieveLocalKey(int keyid, char *keyfp, size_t keyfplen, char *idfp, size_t idfplen, qbool *issigned) // return value: -1 if more to come, +1 if valid, 0 if end of list
 {
        if(keyid < 0 || keyid >= MAX_PUBKEYS)
                return 0;
@@ -785,7 +811,7 @@ static void Crypto_BuildChallengeAppend(void)
        challenge_append_length = p - challenge_append;
 }
 
-static qboolean Crypto_SavePubKeyTextFile(int i)
+static qbool Crypto_SavePubKeyTextFile(int i)
 {
        qfile_t *f;
        char vabuf[1024];
@@ -1068,7 +1094,7 @@ void Crypto_Init(void)
 }
 // end
 
-qboolean Crypto_Available(void)
+qbool Crypto_Available(void)
 {
        if(!d0_blind_id_dll)
                return false;
@@ -1188,7 +1214,7 @@ static void Crypto_KeyGen_Finished(int code, size_t length_received, unsigned ch
        SV_UnlockThreadMutex();
 }
 
-static void Crypto_KeyGen_f(void)
+static void Crypto_KeyGen_f(cmd_state_t *cmd)
 {
        int i;
        const char *p[1];
@@ -1206,14 +1232,14 @@ static void Crypto_KeyGen_f(void)
                Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
                return;
        }
-       if(Cmd_Argc() != 3)
+       if(Cmd_Argc(cmd) != 3)
        {
-               Con_Printf("usage:\n%s id url\n", Cmd_Argv(0));
+               Con_Printf("usage:\n%s id url\n", Cmd_Argv(cmd, 0));
                return;
        }
        SV_LockThreadMutex();
        Crypto_LoadKeys();
-       i = atoi(Cmd_Argv(1));
+       i = atoi(Cmd_Argv(cmd, 1));
        if(!pubkeys[i])
        {
                Con_Printf("there is no public key %d\n", i);
@@ -1313,8 +1339,8 @@ static void Crypto_KeyGen_f(void)
                SV_UnlockThreadMutex();
                return;
        }
-       buf2pos = strlen(Cmd_Argv(2));
-       memcpy(buf2, Cmd_Argv(2), buf2pos);
+       buf2pos = strlen(Cmd_Argv(cmd, 2));
+       memcpy(buf2, Cmd_Argv(cmd, 2), buf2pos);
        if(!(buf2l = Crypto_UnParsePack(buf2 + buf2pos, sizeof(buf2) - buf2pos - 1, FOURCC_D0IQ, p, l, 1)))
        {
                Con_Printf("Crypto_UnParsePack failed\n");
@@ -1344,14 +1370,14 @@ static void Crypto_KeyGen_f(void)
 // end
 
 // console commands
-static void Crypto_Reload_f(void)
+static void Crypto_Reload_f(cmd_state_t *cmd)
 {
        Crypto_ClearHostKeys();
        Crypto_UnloadKeys();
        Crypto_LoadKeys();
 }
 
-static void Crypto_Keys_f(void)
+static void Crypto_Keys_f(cmd_state_t *cmd)
 {
        int i;
        if(!d0_blind_id_dll)
@@ -1374,7 +1400,7 @@ static void Crypto_Keys_f(void)
        }
 }
 
-static void Crypto_HostKeys_f(void)
+static void Crypto_HostKeys_f(cmd_state_t *cmd)
 {
        int i;
        crypto_storedhostkey_t *hk;
@@ -1399,7 +1425,7 @@ static void Crypto_HostKeys_f(void)
        }
 }
 
-static void Crypto_HostKey_Clear_f(void)
+static void Crypto_HostKey_Clear_f(cmd_state_t *cmd)
 {
        lhnetaddress_t addr;
        int i;
@@ -1410,12 +1436,12 @@ static void Crypto_HostKey_Clear_f(void)
                return;
        }
 
-       for(i = 1; i < Cmd_Argc(); ++i)
+       for(i = 1; i < Cmd_Argc(cmd); ++i)
        {
-               LHNETADDRESS_FromString(&addr, Cmd_Argv(i), 26000);
+               LHNETADDRESS_FromString(&addr, Cmd_Argv(cmd, i), 26000);
                if(Crypto_ClearHostKey(&addr))
                {
-                       Con_Printf("cleared host key for %s\n", Cmd_Argv(i));
+                       Con_Printf("cleared host key for %s\n", Cmd_Argv(cmd, i));
                }
        }
 }
@@ -1424,11 +1450,12 @@ void Crypto_Init_Commands(void)
 {
        if(d0_blind_id_dll)
        {
-               Cmd_AddCommand("crypto_reload", Crypto_Reload_f, "reloads cryptographic keys");
-               Cmd_AddCommand("crypto_keygen", Crypto_KeyGen_f, "generates and saves a cryptographic key");
-               Cmd_AddCommand("crypto_keys", Crypto_Keys_f, "lists the loaded keys");
-               Cmd_AddCommand("crypto_hostkeys", Crypto_HostKeys_f, "lists the cached host keys");
-               Cmd_AddCommand("crypto_hostkey_clear", Crypto_HostKey_Clear_f, "clears a cached host key");
+               Cmd_AddCommand(CF_SHARED, "crypto_reload", Crypto_Reload_f, "reloads cryptographic keys");
+               Cmd_AddCommand(CF_SHARED, "crypto_keygen", Crypto_KeyGen_f, "generates and saves a cryptographic key");
+               Cmd_AddCommand(CF_SHARED, "crypto_keys", Crypto_Keys_f, "lists the loaded keys");
+               Cmd_AddCommand(CF_SHARED, "crypto_hostkeys", Crypto_HostKeys_f, "lists the cached host keys");
+               Cmd_AddCommand(CF_SHARED, "crypto_hostkey_clear", Crypto_HostKey_Clear_f, "clears a cached host key");
+
                Cvar_RegisterVariable(&crypto_developer);
                if(d0_rijndael_dll)
                        Cvar_RegisterVariable(&crypto_aeslevel);
@@ -1666,7 +1693,7 @@ const char *Crypto_GetInfoResponseDataString(void)
 }
 
 // network protocol
-qboolean Crypto_ServerAppendToChallenge(const char *data_in, size_t len_in, char *data_out, size_t *len_out, size_t maxlen_out)
+qbool Crypto_ServerAppendToChallenge(const char *data_in, size_t len_in, char *data_out, size_t *len_out, size_t maxlen_out)
 {
        // cheap op, all is precomputed
        if(!d0_blind_id_dll)
@@ -1722,12 +1749,12 @@ static int Crypto_ServerParsePacket_Internal(const char *data_in, size_t len_in,
                        return CRYPTO_NOMATCH; // will be later accepted if encryption was set up
                // validate the challenge
                for (i = 0;i < MAX_CHALLENGES;i++)
-                       if(challenge[i].time > 0)
-                               if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
+                       if(challenges[i].time > 0)
+                               if (!LHNETADDRESS_Compare(peeraddress, &challenges[i].address) && !strcmp(challenges[i].string, s))
                                        break;
                // if the challenge is not recognized, drop the packet
                if (i == MAX_CHALLENGES) // challenge mismatch is silent
-                       return CRYPTO_DISCARD; // pre-challenge: rather be silent
+                       return Crypto_SoftServerError(data_out, len_out, "missing challenge in connect");
 
                crypto = Crypto_ServerFindInstance(peeraddress, false);
                if(!crypto || !crypto->authenticated)
@@ -1742,23 +1769,23 @@ static int Crypto_ServerParsePacket_Internal(const char *data_in, size_t len_in,
                id = (cnt ? atoi(cnt) : -1);
                cnt = InfoString_GetValue(string + 4, "cnt", infostringvalue, sizeof(infostringvalue));
                if(!cnt)
-                       return CRYPTO_DISCARD; // pre-challenge: rather be silent
+                       return Crypto_SoftServerError(data_out, len_out, "missing cnt in d0pk");
                GetUntilNul(&data_in, &len_in);
                if(!data_in)
-                       return CRYPTO_DISCARD; // pre-challenge: rather be silent
+                       return Crypto_SoftServerError(data_out, len_out, "missing appended data in d0pk");
                if(!strcmp(cnt, "0"))
                {
                        int i;
                        if (!(s = InfoString_GetValue(string + 4, "challenge", infostringvalue, sizeof(infostringvalue))))
-                               return CRYPTO_DISCARD; // pre-challenge: rather be silent
+                               return Crypto_SoftServerError(data_out, len_out, "missing challenge in d0pk\\0");
                        // validate the challenge
                        for (i = 0;i < MAX_CHALLENGES;i++)
-                               if(challenge[i].time > 0)
-                                       if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
+                               if(challenges[i].time > 0)
+                                       if (!LHNETADDRESS_Compare(peeraddress, &challenges[i].address) && !strcmp(challenges[i].string, s))
                                                break;
                        // if the challenge is not recognized, drop the packet
-                       if (i == MAX_CHALLENGES) // challenge mismatch is silent
-                               return CRYPTO_DISCARD; // pre-challenge: rather be silent
+                       if (i == MAX_CHALLENGES)
+                               return Crypto_SoftServerError(data_out, len_out, "invalid challenge in d0pk\\0");
 
                        if (!(s = InfoString_GetValue(string + 4, "aeslevel", infostringvalue, sizeof(infostringvalue))))
                                aeslevel = 0; // not supported
@@ -2014,8 +2041,8 @@ int Crypto_ServerParsePacket(const char *data_in, size_t len_in, char *data_out,
        double t = 0;
        static double complain_time = 0;
        const char *cnt;
-       qboolean do_time = false;
-       qboolean do_reject = false;
+       qbool do_time = false;
+       qbool do_reject = false;
        char infostringvalue[MAX_INPUTLINE];
        if(crypto_servercpupercent.value > 0 || crypto_servercpumaxtime.value > 0)
                if(len_in > 5 && !memcmp(data_in, "d0pk\\", 5))
@@ -2031,7 +2058,7 @@ int Crypto_ServerParsePacket(const char *data_in, size_t len_in, char *data_out,
                // check if we may perform crypto...
                if(crypto_servercpupercent.value > 0)
                {
-                       crypto_servercpu_accumulator += (realtime - crypto_servercpu_lastrealtime) * crypto_servercpupercent.value * 0.01;
+                       crypto_servercpu_accumulator += (host.realtime - crypto_servercpu_lastrealtime) * crypto_servercpupercent.value * 0.01;
                        if(crypto_servercpumaxtime.value)
                                if(crypto_servercpu_accumulator > crypto_servercpumaxtime.value)
                                        crypto_servercpu_accumulator = crypto_servercpumaxtime.value;
@@ -2039,13 +2066,13 @@ int Crypto_ServerParsePacket(const char *data_in, size_t len_in, char *data_out,
                else
                {
                        if(crypto_servercpumaxtime.value > 0)
-                               if(realtime != crypto_servercpu_lastrealtime)
+                               if(host.realtime != crypto_servercpu_lastrealtime)
                                        crypto_servercpu_accumulator = crypto_servercpumaxtime.value;
                }
-               crypto_servercpu_lastrealtime = realtime;
+               crypto_servercpu_lastrealtime = host.realtime;
                if(do_reject && crypto_servercpu_accumulator < 0)
                {
-                       if(realtime > complain_time + 5)
+                       if(host.realtime > complain_time + 5)
                                Con_Printf("crypto: cannot perform requested crypto operations; denial service attack or crypto_servercpupercent/crypto_servercpumaxtime are too low\n");
                        *len_out = 0;
                        return CRYPTO_DISCARD;
@@ -2075,7 +2102,7 @@ static int Crypto_ClientError(char *data_out, size_t *len_out, const char *msg)
 static int Crypto_SoftClientError(char *data_out, size_t *len_out, const char *msg)
 {
        *len_out = 0;
-       Con_Printf("%s\n", msg);
+       Con_DPrintf("%s\n", msg);
        return CRYPTO_DISCARD;
 }
 
@@ -2180,10 +2207,14 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out,
                const char *p;
                int i;
                int clientid = -1, serverid = -1, wantserverid = -1;
-               qboolean server_can_auth = true;
+               qbool server_can_auth = true;
                char wantserver_idfp[FP64_SIZE+1];
                int wantserver_aeslevel = 0;
-               qboolean wantserver_issigned = false;
+               qbool wantserver_issigned = false;
+
+               // Must check the source IP here, if we want to prevent other servers' replies from falsely advancing the crypto state, preventing successful connect to the real server.
+               if (net_sourceaddresscheck.integer && LHNETADDRESS_Compare(peeraddress, &cls.connect_address))
+                       return Crypto_SoftClientError(data_out, len_out, "challenge message from wrong server");
 
                // 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)
@@ -2201,7 +2232,7 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out,
                GetUntilNul(&data_in, &len_in);
                if(!data_in)
                        return (wantserverid >= 0) ? Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present") :
-                               (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) :
+                               (d0_rijndael_dll && crypto_aeslevel.integer >= 3) ? Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)") :
                                CRYPTO_NOMATCH;
 
                // FTEQW extension protocol
@@ -2237,7 +2268,7 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out,
 
                if(!vlen_blind_id_ptr)
                        return (wantserverid >= 0) ? Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though authentication is required") :
-                               (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) :
+                               (d0_rijndael_dll && crypto_aeslevel.integer >= 3) ? Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)") :
                                CRYPTO_NOMATCH;
 
                data_in = vlen_blind_id_ptr;
@@ -2302,7 +2333,7 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out,
                                default: // dummy, never happens, but to make gcc happy...
                                case 0:
                                        if(wantserver_aeslevel >= 3)
-                                               return Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL);
+                                               return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
                                        CDATA->wantserver_aes = false;
                                        break;
                                case 1:
@@ -2313,7 +2344,7 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out,
                                        break;
                                case 3:
                                        if(wantserver_aeslevel <= 0)
-                                               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);
+                                               return Crypto_ClientError(data_out, len_out, "This server requires encryption to be supported (crypto_aeslevel >= 1, and d0_rijndael library must be present)");
                                        CDATA->wantserver_aes = true;
                                        break;
                        }
@@ -2373,7 +2404,6 @@ 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;
                        }
-
                        return CRYPTO_DISCARD;
                }
                else
@@ -2381,7 +2411,7 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out,
                        if(wantserver_idfp[0]) // if we know a host key, honor its encryption setting
                        if(wantserver_aeslevel >= 3)
                                return Crypto_ClientError(data_out, len_out, "Server insists on encryption, but neither can authenticate to the other");
-                       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) :
+                       return (d0_rijndael_dll && crypto_aeslevel.integer >= 3) ? Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)") :
                                CRYPTO_NOMATCH;
                }
        }
@@ -2389,6 +2419,11 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out,
        {
                const char *cnt;
                int id;
+
+               // Must check the source IP here, if we want to prevent other servers' replies from falsely advancing the crypto state, preventing successful connect to the real server.
+               if (net_sourceaddresscheck.integer && LHNETADDRESS_Compare(peeraddress, &cls.connect_address))
+                       return Crypto_SoftClientError(data_out, len_out, "d0pk\\ message from wrong server");
+
                cnt = InfoString_GetValue(string + 4, "id", infostringvalue, sizeof(infostringvalue));
                id = (cnt ? atoi(cnt) : -1);
                cnt = InfoString_GetValue(string + 4, "cnt", infostringvalue, sizeof(infostringvalue));
@@ -2402,11 +2437,11 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out,
                {
                        if(id >= 0)
                                if(CDATA->cdata_id != id)
-                                       return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
+                                       return Crypto_SoftClientError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
                        if(CDATA->next_step != 1)
                                return Crypto_SoftClientError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
 
-                       cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
+                       cls.connect_nextsendtime = max(cls.connect_nextsendtime, host.realtime + 1); // prevent "hammering"
 
                        if((s = InfoString_GetValue(string + 4, "aes", infostringvalue, sizeof(infostringvalue))))
                                aes = atoi(s);
@@ -2451,11 +2486,11 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out,
 
                        if(id >= 0)
                                if(CDATA->cdata_id != id)
-                                       return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
+                                       return Crypto_SoftClientError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
                        if(CDATA->next_step != 3)
                                return Crypto_SoftClientError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
 
-                       cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
+                       cls.connect_nextsendtime = max(cls.connect_nextsendtime, host.realtime + 1); // prevent "hammering"
 
                        if(!qd0_blind_id_authenticate_with_private_id_verify(CDATA->id, data_in, len_in, msgbuf, &msgbuflen, &status))
                        {
@@ -2533,11 +2568,11 @@ int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out,
 
                        if(id >= 0)
                                if(CDATA->cdata_id != id)
-                                       return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
+                                       return Crypto_SoftClientError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
                        if(CDATA->next_step != 5)
                                return Crypto_SoftClientError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
 
-                       cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
+                       cls.connect_nextsendtime = max(cls.connect_nextsendtime, host.realtime + 1); // prevent "hammering"
 
                        if(CDATA->s < 0) // only if server didn't auth
                        {