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serval-dna/nacl/nacl-20110221/curvecp/curvecpserver.c
Daniel O'Connor bf9710fd5a Unpacked nacl-20110221 after processing by nacl-prepare-sources. 
This only affects build_android, if nacl-gcc-prep is run then build/`uname -s` will be created.
2012-02-27 12:40:14 +10:30

498 lines
16 KiB
C
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#include <signal.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <poll.h>
#include "e.h"
#include "die.h"
#include "byte.h"
#include "open.h"
#include "load.h"
#include "socket.h"
#include "uint64_pack.h"
#include "uint64_unpack.h"
#include "writeall.h"
#include "nanoseconds.h"
#include "safenonce.h"
#include "nameparse.h"
#include "hexparse.h"
#include "portparse.h"
#include "randommod.h"
#include "randombytes.h"
#include "crypto_box.h"
#include "crypto_secretbox.h"
#if crypto_box_PUBLICKEYBYTES != 32
error!
#endif
#if crypto_box_NONCEBYTES != 24
error!
#endif
#if crypto_box_BOXZEROBYTES != 16
error!
#endif
#if crypto_box_ZEROBYTES != 32
error!
#endif
#if crypto_box_BEFORENMBYTES != 32
error!
#endif
#if crypto_secretbox_KEYBYTES != 32
error!
#endif
#if crypto_secretbox_NONCEBYTES != 24
error!
#endif
#if crypto_secretbox_BOXZEROBYTES != 16
error!
#endif
#if crypto_secretbox_ZEROBYTES != 32
error!
#endif
int flagverbose;
#define USAGE "\
curvecpserver: how to use:\n\
curvecpserver: -q (optional): no error messages\n\
curvecpserver: -Q (optional): print error messages (default)\n\
curvecpserver: -v (optional): print extra information\n\
curvecpserver: -c n (optional): allow at most n clients at once (default 100)\n\
curvecpserver: sname: server's name\n\
curvecpserver: keydir: use this public-key directory\n\
curvecpserver: ip: server's IP address\n\
curvecpserver: port: server's UDP port\n\
curvecpserver: ext: server's extension\n\
curvecpserver: prog: run this server\n\
"
void die_usage(const char *s)
{
if (s) die_4(100,USAGE,"curvecpserver: fatal: ",s,"\n");
die_1(100,USAGE);
}
void die_fatal(const char *trouble,const char *d,const char *fn)
{
if (!flagverbose) die_0(111);
if (d) {
if (fn) die_9(111,"curvecpserver: fatal: ",trouble," ",d,"/",fn,": ",e_str(errno),"\n");
die_7(111,"curvecpserver: fatal: ",trouble," ",d,": ",e_str(errno),"\n");
}
die_5(111,"curvecpserver: fatal: ",trouble,": ",e_str(errno),"\n");
}
int ipparse(unsigned char *y,const char *x)
{
long long j;
long long k;
long long d;
for (k = 0;k < 4;++k) y[k] = 0;
for (k = 0;k < 4;++k) {
d = 0;
for (j = 0;j < 3 && x[j] >= '0' && x[j] <= '9';++j) d = d * 10 + (x[j] - '0');
if (j == 0) return 0;
x += j;
if (k >= 0 && k < 4) y[k] = d;
if (k < 3) {
if (*x != '.') return 0;
++x;
}
}
if (*x) return 0;
return 1;
}
int maxparse(long long *y,const char *x)
{
long long d;
long long j;
d = 0;
for (j = 0;j < 9 && x[j] >= '0' && x[j] <= '9';++j) d = d * 10 + (x[j] - '0');
if (x[j]) return 0;
if (d < 1) return 0;
if (d > 65535) return 0;
*y = d;
return 1;
}
/* cookies: */
long long nextminute;
unsigned char minutekey[32];
unsigned char lastminutekey[32];
/* routing to the server: */
unsigned char serverip[4];
unsigned char serverport[2];
unsigned char serverextension[16];
int udpfd = -1;
/* server security: */
char *keydir = 0;
unsigned char servername[256];
unsigned char serverlongtermsk[32];
unsigned char servershorttermpk[32];
unsigned char servershorttermsk[32];
/* routing to the client: */
unsigned char clientextension[16];
/* client security: */
unsigned char clientlongtermpk[32];
unsigned char clientshorttermpk[32];
/* shared secrets: */
unsigned char clientshortserverlong[32];
unsigned char clientshortservershort[32];
unsigned char clientlongserverlong[32];
unsigned char allzero[128] = {0};
unsigned char nonce[24];
unsigned char text[2048];
unsigned char packetip[4];
unsigned char packetport[2];
unsigned char packet[4096];
crypto_uint64 packetnonce;
#define MESSAGELEN 1104
struct activeclient {
unsigned char clientshorttermpk[32];
unsigned char clientshortservershort[32];
crypto_uint64 receivednonce;
crypto_uint64 sentnonce;
long long messagelen;
pid_t child;
int tochild;
int fromchild;
unsigned char clientextension[16];
unsigned char clientip[4];
unsigned char clientport[2];
unsigned char message[MESSAGELEN];
} ;
const char *strmaxactiveclients = "100";
long long maxactiveclients = 0;
long long numactiveclients = 0;
struct activeclient *activeclients = 0;
struct pollfd *p;
int fdwd = -1;
int pi0[2];
int pi1[2];
unsigned char childbuf[4096];
long long childbuflen = 0;
unsigned char childmessage[2048];
long long childmessagelen = 0;
int main(int argc,char **argv)
{
long long r;
long long i;
long long k;
signal(SIGPIPE,SIG_IGN);
signal(SIGCHLD,SIG_IGN);
if (!argv[0]) die_usage(0);
for (;;) {
char *x;
if (!argv[1]) break;
if (argv[1][0] != '-') break;
x = *++argv;
if (x[0] == '-' && x[1] == 0) break;
if (x[0] == '-' && x[1] == '-' && x[2] == 0) break;
while (*++x) {
if (*x == 'q') { flagverbose = 0; continue; }
if (*x == 'Q') { flagverbose = 1; continue; }
if (*x == 'v') { if (flagverbose == 2) flagverbose = 3; else flagverbose = 2; continue; }
if (*x == 'c') {
if (x[1]) { strmaxactiveclients = x + 1; break; }
if (argv[1]) { strmaxactiveclients = *++argv; break; }
}
die_usage(0);
}
}
if (!maxparse(&maxactiveclients,strmaxactiveclients)) die_usage("concurrency must be between 1 and 65535");
if (!nameparse(servername,*++argv)) die_usage("sname must be at most 255 bytes, at most 63 bytes between dots");
keydir = *++argv; if (!keydir) die_usage("missing keydir");
if (!ipparse(serverip,*++argv)) die_usage("ip must be an IPv4 address");
if (!portparse(serverport,*++argv)) die_usage("port must be an integer between 0 and 65535");
if (!hexparse(serverextension,16,*++argv)) die_usage("ext must be exactly 32 hex characters");
if (!*++argv) die_usage("missing prog");
for (;;) {
r = open_read("/dev/null");
if (r == -1) die_fatal("unable to open /dev/null",0,0);
if (r > 9) { close(r); break; }
}
activeclients = malloc(maxactiveclients * sizeof(struct activeclient));
if (!activeclients) die_fatal("unable to create activeclients array",0,0);
randombytes((void *) activeclients,maxactiveclients * sizeof(struct activeclient));
for (i = 0;i < maxactiveclients;++i) {
activeclients[i].child = -1;
activeclients[i].tochild = -1;
activeclients[i].fromchild = -1;
activeclients[i].receivednonce = 0;
activeclients[i].sentnonce = randommod(281474976710656LL);
}
p = malloc((1 + maxactiveclients) * sizeof(struct pollfd));
if (!p) die_fatal("unable to create poll array",0,0);
fdwd = open_cwd();
if (fdwd == -1) die_fatal("unable to open current directory",0,0);
if (chdir(keydir) == -1) die_fatal("unable to chdir to",keydir,0);
if (load(".expertsonly/secretkey",serverlongtermsk,sizeof serverlongtermsk) == -1) die_fatal("unable to read secret key from",keydir,0);
udpfd = socket_udp();
if (udpfd == -1) die_fatal("unable to create socket",0,0);
if (socket_bind(udpfd,serverip,serverport) == -1) die_fatal("unable to bind socket",0,0);
randombytes(minutekey,sizeof minutekey);
randombytes(lastminutekey,sizeof lastminutekey);
nextminute = nanoseconds() + 60000000000ULL;
for (;;) {
long long timeout = nextminute - nanoseconds();
if (timeout <= 0) {
timeout = 60000000000ULL;
byte_copy(lastminutekey,sizeof lastminutekey,minutekey);
randombytes(minutekey,sizeof minutekey);
nextminute = nanoseconds() + timeout;
randombytes(packet,sizeof packet);
randombytes(packetip,sizeof packetip);
randombytes(packetport,sizeof packetport);
randombytes(clientshorttermpk,sizeof clientshorttermpk);
randombytes(clientshortserverlong,sizeof clientshortserverlong);
randombytes(nonce,sizeof nonce);
randombytes(text,sizeof text);
randombytes(childbuf,sizeof childbuf);
randombytes(childmessage,sizeof childmessage);
randombytes(servershorttermpk,sizeof servershorttermpk);
randombytes(servershorttermsk,sizeof servershorttermsk);
}
for (i = 0;i < numactiveclients;++i) {
p[i].fd = activeclients[i].fromchild;
p[i].events = POLLIN;
}
p[numactiveclients].fd = udpfd;
p[numactiveclients].events = POLLIN;
if (poll(p,1 + numactiveclients,timeout / 1000000 + 1) < 0) continue;
do { /* try receiving a packet: */
if (!p[numactiveclients].revents) break;
r = socket_recv(udpfd,packet,sizeof packet,packetip,packetport);
if (r < 80) break;
if (r > 1184) break;
if (r & 15) break;
if (!(byte_isequal(packet,7,"QvnQ5Xl") & byte_isequal(packet + 8,16,serverextension))) break;
byte_copy(clientextension,16,packet + 24);
if (packet[7] == 'H') { /* Hello packet: */
if (r != 224) break;
byte_copy(clientshorttermpk,32,packet + 40);
crypto_box_beforenm(clientshortserverlong,clientshorttermpk,serverlongtermsk);
byte_copy(nonce,16,"CurveCP-client-H");
byte_copy(nonce + 16,8,packet + 136);
byte_zero(text,16);
byte_copy(text + 16,80,packet + 144);
if (crypto_box_open_afternm(text,text,96,nonce,clientshortserverlong)) break;
/* send Cookie packet: */
crypto_box_keypair(servershorttermpk,servershorttermsk);
byte_zero(text + 64,32);
byte_copy(text + 96,32,clientshorttermpk);
byte_copy(text + 128,32,servershorttermsk);
byte_copy(nonce,8,"minute-k");
if (safenonce(nonce + 8,1) == -1) die_fatal("nonce-generation disaster",0,0);
crypto_secretbox(text + 64,text + 64,96,nonce,minutekey);
byte_copy(text + 64,16,nonce + 8);
byte_zero(text,32);
byte_copy(text + 32,32,servershorttermpk);
byte_copy(nonce,8,"CurveCPK"); /* reusing the other 16 bytes */
crypto_box_afternm(text,text,160,nonce,clientshortserverlong);
byte_copy(packet,8,"RL3aNMXK");
byte_copy(packet + 8,16,clientextension);
byte_copy(packet + 24,16,serverextension);
byte_copy(packet + 40,16,nonce + 8);
byte_copy(packet + 56,144,text + 16);
socket_send(udpfd,packet,200,packetip,packetport);
}
if (packet[7] == 'I') { /* Initiate packet: */
if (r < 560) break;
for (i = 0;i < numactiveclients;++i) /* XXX use better data structure */
if (byte_isequal(activeclients[i].clientshorttermpk,32,packet + 40))
break;
if (i < numactiveclients) {
packetnonce = uint64_unpack(packet + 168);
if (packetnonce <= activeclients[i].receivednonce) break;
byte_copy(nonce,16,"CurveCP-client-I");
byte_copy(nonce + 16,8,packet + 168);
byte_zero(text,16);
byte_copy(text + 16,r - 176,packet + 176);
if (crypto_box_open_afternm(text,text,r - 160,nonce,activeclients[i].clientshortservershort)) break;
/* XXX: update clientip, clientextension; but not if client has spoken recently */
activeclients[i].receivednonce = packetnonce;
text[383] = (r - 544) >> 4;
if (writeall(activeclients[i].tochild,text + 383,r - 543) == -1)
; /* child is gone; will see eof later */
break;
}
if (i == maxactiveclients) break;
byte_copy(nonce,8,"minute-k");
byte_copy(nonce + 8,16,packet + 72);
byte_zero(text,16);
byte_copy(text + 16,80,packet + 88);
if (crypto_secretbox_open(text,text,96,nonce,minutekey)) {
byte_zero(text,16);
byte_copy(text + 16,80,packet + 88);
if (crypto_secretbox_open(text,text,96,nonce,lastminutekey)) break;
}
if (!byte_isequal(packet + 40,32,text + 32)) break;
byte_copy(servershorttermsk,32,text + 64);
byte_copy(clientshorttermpk,32,packet + 40);
crypto_box_beforenm(clientshortservershort,clientshorttermpk,servershorttermsk);
byte_copy(nonce,16,"CurveCP-client-I");
byte_copy(nonce + 16,8,packet + 168);
byte_zero(text,16);
byte_copy(text + 16,r - 176,packet + 176);
if (crypto_box_open_afternm(text,text,r - 160,nonce,clientshortservershort)) break;
if (!byte_isequal(text + 128,256,servername)) break;
/* XXX skip if client authentication is not desired: */
byte_copy(clientlongtermpk,32,text + 32);
/* XXX impose policy limitations on clients: known, maxconn */
/* XXX for known clients, retrieve shared secret from cache: */
crypto_box_beforenm(clientlongserverlong,clientlongtermpk,serverlongtermsk);
byte_copy(nonce,8,"CurveCPV");
byte_copy(nonce + 8,16,text + 64);
byte_zero(text + 64,16);
if (crypto_box_open_afternm(text + 64,text + 64,64,nonce,clientlongserverlong)) break;
if (!byte_isequal(text + 96,32,clientshorttermpk)) break;
if (open_pipe(pi0) == -1) break; /* XXX: error message */
if (open_pipe(pi1) == -1) { close(pi0[0]); close(pi0[1]); break; } /* XXX: error message */
activeclients[i].child = fork();
if (activeclients[i].child == -1) {
close(pi0[0]); close(pi0[1]);
close(pi1[0]); close(pi1[1]);
break; /* XXX: error message */
}
if (activeclients[i].child == 0) {
if (fchdir(fdwd) == -1) die_fatal("unable to chdir to original directory",0,0);
close(8);
if (dup(pi0[0]) != 8) die_fatal("unable to dup",0,0);
close(9);
if (dup(pi1[1]) != 9) die_fatal("unable to dup",0,0);
/* XXX: set up environment variables */
signal(SIGPIPE,SIG_DFL);
signal(SIGCHLD,SIG_DFL);
execvp(*argv,argv);
die_fatal("unable to run",*argv,0);
}
activeclients[i].tochild = pi0[1]; close(pi0[0]);
activeclients[i].fromchild = pi1[0]; close(pi1[1]);
activeclients[i].messagelen = 0;
byte_copy(activeclients[i].clientshorttermpk,32,clientshorttermpk);
byte_copy(activeclients[i].clientshortservershort,32,clientshortservershort);
activeclients[i].receivednonce = uint64_unpack(packet + 168);
byte_copy(activeclients[i].clientextension,16,clientextension);
byte_copy(activeclients[i].clientip,4,packetip);
byte_copy(activeclients[i].clientport,2,packetport);
++numactiveclients;
text[383] = (r - 544) >> 4;
if (writeall(activeclients[i].tochild,text + 383,r - 543) == -1)
; /* child is gone; will see eof later */
}
if (packet[7] == 'M') { /* Message packet: */
if (r < 112) break;
for (i = 0;i < numactiveclients;++i) /* XXX use better data structure */
if (byte_isequal(activeclients[i].clientshorttermpk,32,packet + 40))
break;
if (i < numactiveclients) {
packetnonce = uint64_unpack(packet + 72);
if (packetnonce <= activeclients[i].receivednonce) break;
byte_copy(nonce,16,"CurveCP-client-M");
byte_copy(nonce + 16,8,packet + 72);
byte_zero(text,16);
byte_copy(text + 16,r - 80,packet + 80);
if (crypto_box_open_afternm(text,text,r - 64,nonce,activeclients[i].clientshortservershort)) break;
/* XXX: update clientip, clientextension */
activeclients[i].receivednonce = packetnonce;
text[31] = (r - 96) >> 4;
if (writeall(activeclients[i].tochild,text + 31,r - 95) == -1)
; /* child is gone; will see eof later */
break;
}
}
} while (0);
for (i = numactiveclients - 1;i >= 0;--i) {
do {
if (!p[i].revents) break;
r = read(activeclients[i].fromchild,childbuf,sizeof childbuf);
if (r == -1) if (errno == EINTR || errno == EWOULDBLOCK || errno == EAGAIN) break;
if (r <= 0) goto endconnection;
childbuflen = r;
for (k = 0;k < childbuflen;++k) {
r = activeclients[i].messagelen;
if (r < 0) goto endconnection;
if (r >= MESSAGELEN) goto endconnection;
activeclients[i].message[r] = childbuf[k];
if (r == 0) if (childbuf[k] & 128) goto endconnection;
activeclients[i].messagelen = r + 1;
if (r == 16 * (unsigned long long) activeclients[i].message[0]) {
if (r < 16) goto endconnection;
if (r > 1088) goto endconnection;
byte_copy(nonce,16,"CurveCP-server-M");
uint64_pack(nonce + 16,++activeclients[i].sentnonce);
byte_zero(text,32);
byte_copy(text + 32,r,activeclients[i].message + 1);
crypto_box_afternm(text,text,r + 32,nonce,activeclients[i].clientshortservershort);
byte_copy(packet,8,"RL3aNMXM");
byte_copy(packet + 8,16,clientextension);
byte_copy(packet + 24,16,serverextension);
byte_copy(packet + 40,8,nonce + 16);
byte_copy(packet + 48,r + 16,text + 16);
socket_send(udpfd,packet,r + 64,activeclients[i].clientip,activeclients[i].clientport);
activeclients[i].messagelen = 0;
}
}
break;
endconnection:
/* XXX: cache cookie if it's recent */
close(activeclients[i].fromchild); activeclients[i].fromchild = -1;
close(activeclients[i].tochild); activeclients[i].tochild = -1;
--numactiveclients;
activeclients[i] = activeclients[numactiveclients];
randombytes((void *) &activeclients[numactiveclients],sizeof(struct activeclient));
} while (0);
}
}
}
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