mirror of https://github.com/0intro/conterm
668 lines
15 KiB
C
668 lines
15 KiB
C
/*
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* Various files from /sys/src/cmd/auth/secstore, just enough
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* to download a file at boot time.
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*/
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#include <u.h>
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#include <libc.h>
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#include <mp.h>
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#include <libsec.h>
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#include "drawterm.h"
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static void*
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emalloc(ulong n)
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{
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return mallocz(n, 1);
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}
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enum{ CHK = 16};
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enum{ MAXFILESIZE = 10*1024*1024 };
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enum{// PW status bits
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Enabled = (1<<0),
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STA = (1<<1), // extra SecurID step
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};
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static char testmess[] = "__secstore\tPAK\nC=%s\nm=0\n";
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int
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secdial(char *secstore)
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{
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char *p, buf[80], *f[3];
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int fd, nf;
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p = secstore; /* take it from writehostowner, if set there */
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if(*p == 0) /* else use the authserver */
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p = "$auth";
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/* translate $auth ourselves.
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* authaddr is something like il!host!566 or tcp!host!567.
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* extract host, accounting for a change of format to something
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* like il!host or tcp!host or host.
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*/
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if(strcmp(p, "$auth")==0){
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if(authaddr == nil)
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return -1;
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strecpy(buf, buf+sizeof buf, authaddr);
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nf = getfields(buf, f, nelem(f), 0, "!");
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switch(nf){
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default:
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return -1;
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case 1:
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p = f[0];
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break;
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case 2:
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case 3:
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p = f[1];
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break;
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}
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}
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fd = dial(netmkaddr(p, "tcp", "5356"), 0, 0, 0);
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if(fd >= 0)
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return fd;
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return -1;
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}
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int
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havesecstore(char *addr, char *owner)
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{
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int m, n, fd;
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uchar buf[500];
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n = snprint((char*)buf, sizeof buf, testmess, owner);
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hnputs(buf, 0x8000+n-2);
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fd = secdial(addr);
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if(fd < 0)
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return 0;
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if(write(fd, buf, n) != n || readn(fd, buf, 2) != 2){
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close(fd);
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return 0;
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}
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n = ((buf[0]&0x7f)<<8) + buf[1];
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if(n+1 > sizeof buf){
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werrstr("implausibly large count %d", n);
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close(fd);
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return 0;
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}
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m = readn(fd, buf, n);
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close(fd);
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if(m != n){
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if(m >= 0)
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werrstr("short read from secstore");
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return 0;
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}
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buf[n] = 0;
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if(strcmp((char*)buf, "!account expired") == 0){
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werrstr("account expired");
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return 0;
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}
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return strcmp((char*)buf, "!account exists") == 0;
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}
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// delimited, authenticated, encrypted connection
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enum{ Maxmsg=4096 }; // messages > Maxmsg bytes are truncated
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typedef struct SConn SConn;
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extern SConn* newSConn(int); // arg is open file descriptor
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struct SConn{
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void *chan;
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int secretlen;
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int (*secret)(SConn*, uchar*, int);//
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int (*read)(SConn*, uchar*, int); // <0 if error; errmess in buffer
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int (*write)(SConn*, uchar*, int);
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void (*free)(SConn*); // also closes file descriptor
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};
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// secret(s,b,dir) sets secret for digest, encrypt, using the secretlen
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// bytes in b to form keys for the two directions;
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// set dir=0 in client, dir=1 in server
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// error convention: write !message in-band
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#define readstr secstore_readstr
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static void writerr(SConn*, char*);
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static int readstr(SConn*, char*); // call with buf of size Maxmsg+1
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// returns -1 upon error, with error message in buf
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typedef struct ConnState {
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uchar secret[SHA1dlen];
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ulong seqno;
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RC4state rc4;
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} ConnState;
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typedef struct SS{
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int fd; // file descriptor for read/write of encrypted data
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int alg; // if nonzero, "alg sha rc4_128"
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ConnState in, out;
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} SS;
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static int
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SC_secret(SConn *conn, uchar *sigma, int direction)
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{
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SS *ss = (SS*)(conn->chan);
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int nsigma = conn->secretlen;
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if(direction != 0){
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hmac_sha1(sigma, nsigma, (uchar*)"one", 3, ss->out.secret, nil);
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hmac_sha1(sigma, nsigma, (uchar*)"two", 3, ss->in.secret, nil);
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}else{
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hmac_sha1(sigma, nsigma, (uchar*)"two", 3, ss->out.secret, nil);
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hmac_sha1(sigma, nsigma, (uchar*)"one", 3, ss->in.secret, nil);
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}
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setupRC4state(&ss->in.rc4, ss->in.secret, 16); // restrict to 128 bits
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setupRC4state(&ss->out.rc4, ss->out.secret, 16);
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ss->alg = 1;
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return 0;
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}
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static void
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hash(uchar secret[SHA1dlen], uchar *data, int len, int seqno, uchar d[SHA1dlen])
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{
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DigestState sha;
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uchar seq[4];
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seq[0] = seqno>>24;
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seq[1] = seqno>>16;
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seq[2] = seqno>>8;
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seq[3] = seqno;
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memset(&sha, 0, sizeof sha);
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sha1(secret, SHA1dlen, nil, &sha);
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sha1(data, len, nil, &sha);
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sha1(seq, 4, d, &sha);
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}
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static int
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verify(uchar secret[SHA1dlen], uchar *data, int len, int seqno, uchar d[SHA1dlen])
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{
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DigestState sha;
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uchar seq[4];
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uchar digest[SHA1dlen];
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seq[0] = seqno>>24;
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seq[1] = seqno>>16;
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seq[2] = seqno>>8;
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seq[3] = seqno;
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memset(&sha, 0, sizeof sha);
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sha1(secret, SHA1dlen, nil, &sha);
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sha1(data, len, nil, &sha);
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sha1(seq, 4, digest, &sha);
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return memcmp(d, digest, SHA1dlen);
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}
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static int
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SC_read(SConn *conn, uchar *buf, int n)
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{
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SS *ss = (SS*)(conn->chan);
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uchar count[2], digest[SHA1dlen];
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int len, nr;
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if(read(ss->fd, count, 2) != 2 || (count[0]&0x80) == 0){
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werrstr("!SC_read invalid count");
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return -1;
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}
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len = (count[0]&0x7f)<<8 | count[1]; // SSL-style count; no pad
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if(ss->alg){
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len -= SHA1dlen;
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if(len <= 0 || readn(ss->fd, digest, SHA1dlen) != SHA1dlen){
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werrstr("!SC_read missing sha1");
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return -1;
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}
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if(len > n || readn(ss->fd, buf, len) != len){
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werrstr("!SC_read missing data");
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return -1;
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}
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rc4(&ss->in.rc4, digest, SHA1dlen);
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rc4(&ss->in.rc4, buf, len);
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if(verify(ss->in.secret, buf, len, ss->in.seqno, digest) != 0){
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werrstr("!SC_read integrity check failed");
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return -1;
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}
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}else{
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if(len <= 0 || len > n){
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werrstr("!SC_read implausible record length");
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return -1;
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}
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if( (nr = readn(ss->fd, buf, len)) != len){
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werrstr("!SC_read expected %d bytes, but got %d", len, nr);
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return -1;
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}
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}
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ss->in.seqno++;
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return len;
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}
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static int
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SC_write(SConn *conn, uchar *buf, int n)
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{
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SS *ss = (SS*)(conn->chan);
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uchar count[2], digest[SHA1dlen];
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int len;
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if(n <= 0 || n > Maxmsg+1){
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werrstr("!SC_write invalid n %d", n);
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return -1;
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}
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len = n;
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if(ss->alg)
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len += SHA1dlen;
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count[0] = 0x80 | len>>8;
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count[1] = len;
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if(write(ss->fd, count, 2) != 2){
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werrstr("!SC_write invalid count");
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return -1;
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}
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if(ss->alg){
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hash(ss->out.secret, buf, n, ss->out.seqno, digest);
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rc4(&ss->out.rc4, digest, SHA1dlen);
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rc4(&ss->out.rc4, buf, n);
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if(write(ss->fd, digest, SHA1dlen) != SHA1dlen ||
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write(ss->fd, buf, n) != n){
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werrstr("!SC_write error on send");
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return -1;
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}
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}else{
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if(write(ss->fd, buf, n) != n){
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werrstr("!SC_write error on send");
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return -1;
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}
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}
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ss->out.seqno++;
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return n;
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}
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static void
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SC_free(SConn *conn)
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{
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SS *ss = (SS*)(conn->chan);
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close(ss->fd);
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free(ss);
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free(conn);
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}
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SConn*
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newSConn(int fd)
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{
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SS *ss;
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SConn *conn;
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if(fd < 0)
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return nil;
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ss = (SS*)emalloc(sizeof(*ss));
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conn = (SConn*)emalloc(sizeof(*conn));
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ss->fd = fd;
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ss->alg = 0;
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conn->chan = (void*)ss;
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conn->secretlen = SHA1dlen;
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conn->free = SC_free;
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conn->secret = SC_secret;
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conn->read = SC_read;
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conn->write = SC_write;
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return conn;
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}
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static void
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writerr(SConn *conn, char *s)
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{
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char buf[Maxmsg];
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snprint(buf, Maxmsg, "!%s", s);
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conn->write(conn, (uchar*)buf, strlen(buf));
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}
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static int
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readstr(SConn *conn, char *s)
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{
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int n;
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n = conn->read(conn, (uchar*)s, Maxmsg);
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if(n >= 0){
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s[n] = 0;
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if(s[0] == '!'){
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memmove(s, s+1, n);
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n = -1;
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}
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}else{
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strcpy(s, "read error");
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}
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return n;
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}
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static char*
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getfile(SConn *conn, uchar *key, int nkey)
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{
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char *buf;
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int nbuf, n, nr, len;
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char s[Maxmsg+1], *gf;
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uchar skey[SHA1dlen], ib[Maxmsg+CHK], *ibr, *ibw;
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AESstate aes;
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DigestState *sha;
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gf = "factotum";
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memset(&aes, 0, sizeof aes);
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snprint(s, Maxmsg, "GET %s\n", gf);
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conn->write(conn, (uchar*)s, strlen(s));
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/* get file size */
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s[0] = '\0';
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if(readstr(conn, s) < 0){
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werrstr("secstore: %r");
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return nil;
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}
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if((len = atoi(s)) < 0){
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werrstr("secstore: remote file %s does not exist", gf);
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return nil;
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}else if(len > MAXFILESIZE){//assert
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werrstr("secstore: implausible file size %d for %s", len, gf);
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return nil;
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}
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ibr = ibw = ib;
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buf = nil;
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nbuf = 0;
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for(nr=0; nr < len;){
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if((n = conn->read(conn, ibw, Maxmsg)) <= 0){
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werrstr("secstore: empty file chunk n=%d nr=%d len=%d: %r", n, nr, len);
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return nil;
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}
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nr += n;
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ibw += n;
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if(!aes.setup){ /* first time, read 16 byte IV */
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if(n < 16){
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werrstr("secstore: no IV in file");
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return nil;
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}
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sha = sha1((uchar*)"aescbc file", 11, nil, nil);
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sha1(key, nkey, skey, sha);
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setupAESstate(&aes, skey, AESbsize, ibr);
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memset(skey, 0, sizeof skey);
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ibr += AESbsize;
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n -= AESbsize;
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}
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aesCBCdecrypt(ibw-n, n, &aes);
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n = ibw-ibr-CHK;
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if(n > 0){
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buf = realloc(buf, nbuf+n+1);
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if(buf == nil)
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sysfatal("out of memory");
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memmove(buf+nbuf, ibr, n);
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nbuf += n;
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ibr += n;
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}
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memmove(ib, ibr, ibw-ibr);
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ibw = ib + (ibw-ibr);
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ibr = ib;
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}
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n = ibw-ibr;
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if((n != CHK) || (memcmp(ib, "XXXXXXXXXXXXXXXX", CHK) != 0)){
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werrstr("secstore: decrypted file failed to authenticate!");
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free(buf);
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return nil;
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}
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if(nbuf == 0){
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werrstr("secstore got empty file");
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return nil;
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}
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buf[nbuf] = '\0';
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return buf;
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}
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static char VERSION[] = "secstore";
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typedef struct PAKparams{
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mpint *q, *p, *r, *g;
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} PAKparams;
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static PAKparams *pak;
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// This group was generated by the seed EB7B6E35F7CD37B511D96C67D6688CC4DD440E1E.
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static void
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initPAKparams(void)
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{
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if(pak)
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return;
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pak = (PAKparams*)emalloc(sizeof(*pak));
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pak->q = strtomp("E0F0EF284E10796C5A2A511E94748BA03C795C13", nil, 16, nil);
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pak->p = strtomp("C41CFBE4D4846F67A3DF7DE9921A49D3B42DC33728427AB159CEC8CBBD"
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"B12B5F0C244F1A734AEB9840804EA3C25036AD1B61AFF3ABBC247CD4B384224567A86"
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"3A6F020E7EE9795554BCD08ABAD7321AF27E1E92E3DB1C6E7E94FAAE590AE9C48F96D9"
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"3D178E809401ABE8A534A1EC44359733475A36A70C7B425125062B1142D", nil, 16, nil);
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pak->r = strtomp("DF310F4E54A5FEC5D86D3E14863921E834113E060F90052AD332B3241CEF"
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"2497EFA0303D6344F7C819691A0F9C4A773815AF8EAECFB7EC1D98F039F17A32A7E887"
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"D97251A927D093F44A55577F4D70444AEBD06B9B45695EC23962B175F266895C67D21"
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"C4656848614D888A4", nil, 16, nil);
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pak->g = strtomp("2F1C308DC46B9A44B52DF7DACCE1208CCEF72F69C743ADD4D2327173444"
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"ED6E65E074694246E07F9FD4AE26E0FDDD9F54F813C40CB9BCD4338EA6F242AB94CD41"
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"0E676C290368A16B1A3594877437E516C53A6EEE5493A038A017E955E218E7819734E3E"
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"2A6E0BAE08B14258F8C03CC1B30E0DDADFCF7CEDF0727684D3D255F1", nil, 16, nil);
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}
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// H = (sha(ver,C,sha(passphrase)))^r mod p,
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// a hash function expensive to attack by brute force.
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static void
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longhash(char *ver, char *C, uchar *passwd, mpint *H)
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{
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uchar *Cp;
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int i, n, nver, nC;
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uchar buf[140], key[1];
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nver = strlen(ver);
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nC = strlen(C);
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n = nver + nC + SHA1dlen;
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Cp = (uchar*)emalloc(n);
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memmove(Cp, ver, nver);
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memmove(Cp+nver, C, nC);
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memmove(Cp+nver+nC, passwd, SHA1dlen);
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for(i = 0; i < 7; i++){
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key[0] = 'A'+i;
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hmac_sha1(Cp, n, key, sizeof key, buf+i*SHA1dlen, nil);
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}
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memset(Cp, 0, n);
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free(Cp);
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betomp(buf, sizeof buf, H);
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mpmod(H, pak->p, H);
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mpexp(H, pak->r, pak->p, H);
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}
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// Hi = H^-1 mod p
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static char *
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PAK_Hi(char *C, char *passphrase, mpint *H, mpint *Hi)
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{
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uchar passhash[SHA1dlen];
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sha1((uchar *)passphrase, strlen(passphrase), passhash, nil);
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initPAKparams();
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longhash(VERSION, C, passhash, H);
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mpinvert(H, pak->p, Hi);
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return mptoa(Hi, 64, nil, 0);
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}
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// another, faster, hash function for each party to
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// confirm that the other has the right secrets.
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static void
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shorthash(char *mess, char *C, char *S, char *m, char *mu, char *sigma, char *Hi, uchar *digest)
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{
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SHA1state *state;
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state = sha1((uchar*)mess, strlen(mess), 0, 0);
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state = sha1((uchar*)C, strlen(C), 0, state);
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state = sha1((uchar*)S, strlen(S), 0, state);
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state = sha1((uchar*)m, strlen(m), 0, state);
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state = sha1((uchar*)mu, strlen(mu), 0, state);
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state = sha1((uchar*)sigma, strlen(sigma), 0, state);
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state = sha1((uchar*)Hi, strlen(Hi), 0, state);
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state = sha1((uchar*)mess, strlen(mess), 0, state);
|
|
state = sha1((uchar*)C, strlen(C), 0, state);
|
|
state = sha1((uchar*)S, strlen(S), 0, state);
|
|
state = sha1((uchar*)m, strlen(m), 0, state);
|
|
state = sha1((uchar*)mu, strlen(mu), 0, state);
|
|
state = sha1((uchar*)sigma, strlen(sigma), 0, state);
|
|
sha1((uchar*)Hi, strlen(Hi), digest, state);
|
|
}
|
|
|
|
// On input, conn provides an open channel to the server;
|
|
// C is the name this client calls itself;
|
|
// pass is the user's passphrase
|
|
// On output, session secret has been set in conn
|
|
// (unless return code is negative, which means failure).
|
|
// If pS is not nil, it is set to the (alloc'd) name the server calls itself.
|
|
static int
|
|
PAKclient(SConn *conn, char *C, char *pass, char **pS)
|
|
{
|
|
char *mess, *mess2, *eol, *S, *hexmu, *ks, *hexm, *hexsigma = nil, *hexHi;
|
|
char kc[2*SHA1dlen+1];
|
|
uchar digest[SHA1dlen];
|
|
int rc = -1, n;
|
|
mpint *x, *m = mpnew(0), *mu = mpnew(0), *sigma = mpnew(0);
|
|
mpint *H = mpnew(0), *Hi = mpnew(0);
|
|
|
|
hexHi = PAK_Hi(C, pass, H, Hi);
|
|
|
|
// random 1<=x<=q-1; send C, m=g**x H
|
|
x = mprand(164, genrandom, nil);
|
|
mpmod(x, pak->q, x);
|
|
if(mpcmp(x, mpzero) == 0)
|
|
mpassign(mpone, x);
|
|
mpexp(pak->g, x, pak->p, m);
|
|
mpmul(m, H, m);
|
|
mpmod(m, pak->p, m);
|
|
hexm = mptoa(m, 64, nil, 0);
|
|
mess = (char*)emalloc(2*Maxmsg+2);
|
|
mess2 = mess+Maxmsg+1;
|
|
snprint(mess, Maxmsg, "%s\tPAK\nC=%s\nm=%s\n", VERSION, C, hexm);
|
|
conn->write(conn, (uchar*)mess, strlen(mess));
|
|
|
|
// recv g**y, S, check hash1(g**xy)
|
|
if(readstr(conn, mess) < 0){
|
|
fprint(2, "error: %s\n", mess);
|
|
writerr(conn, "couldn't read g**y");
|
|
goto done;
|
|
}
|
|
eol = strchr(mess, '\n');
|
|
if(strncmp("mu=", mess, 3) != 0 || !eol || strncmp("\nk=", eol, 3) != 0){
|
|
writerr(conn, "verifier syntax error");
|
|
goto done;
|
|
}
|
|
hexmu = mess+3;
|
|
*eol = 0;
|
|
ks = eol+3;
|
|
eol = strchr(ks, '\n');
|
|
if(!eol || strncmp("\nS=", eol, 3) != 0){
|
|
writerr(conn, "verifier syntax error for secstore 1.0");
|
|
goto done;
|
|
}
|
|
*eol = 0;
|
|
S = eol+3;
|
|
eol = strchr(S, '\n');
|
|
if(!eol){
|
|
writerr(conn, "verifier syntax error for secstore 1.0");
|
|
goto done;
|
|
}
|
|
*eol = 0;
|
|
if(pS)
|
|
*pS = strdup(S);
|
|
strtomp(hexmu, nil, 64, mu);
|
|
mpexp(mu, x, pak->p, sigma);
|
|
hexsigma = mptoa(sigma, 64, nil, 0);
|
|
shorthash("server", C, S, hexm, hexmu, hexsigma, hexHi, digest);
|
|
enc64(kc, sizeof kc, digest, SHA1dlen);
|
|
if(strcmp(ks, kc) != 0){
|
|
writerr(conn, "verifier didn't match");
|
|
goto done;
|
|
}
|
|
|
|
// send hash2(g**xy)
|
|
shorthash("client", C, S, hexm, hexmu, hexsigma, hexHi, digest);
|
|
enc64(kc, sizeof kc, digest, SHA1dlen);
|
|
snprint(mess2, Maxmsg, "k'=%s\n", kc);
|
|
conn->write(conn, (uchar*)mess2, strlen(mess2));
|
|
|
|
// set session key
|
|
shorthash("session", C, S, hexm, hexmu, hexsigma, hexHi, digest);
|
|
memset(hexsigma, 0, strlen(hexsigma));
|
|
n = conn->secret(conn, digest, 0);
|
|
memset(digest, 0, SHA1dlen);
|
|
if(n < 0){//assert
|
|
writerr(conn, "can't set secret");
|
|
goto done;
|
|
}
|
|
|
|
rc = 0;
|
|
done:
|
|
mpfree(x);
|
|
mpfree(sigma);
|
|
mpfree(mu);
|
|
mpfree(m);
|
|
mpfree(Hi);
|
|
mpfree(H);
|
|
free(hexsigma);
|
|
free(hexHi);
|
|
free(hexm);
|
|
free(mess);
|
|
return rc;
|
|
}
|
|
|
|
char*
|
|
secstorefetch(char *addr, char *owner, char *password)
|
|
{
|
|
int fd;
|
|
char *rv;
|
|
char s[Maxmsg+1], bye[10];
|
|
SConn *conn;
|
|
char *pass, *sta;
|
|
|
|
sta = nil;
|
|
conn = nil;
|
|
rv = nil;
|
|
if(password != nil && *password)
|
|
pass = strdup(password);
|
|
else
|
|
pass = readcons("secstore password", nil, 1);
|
|
if(pass==nil || strlen(pass)==0){
|
|
werrstr("cancel");
|
|
goto Out;
|
|
}
|
|
if((fd = secdial(addr)) < 0)
|
|
goto Out;
|
|
if((conn = newSConn(fd)) == nil)
|
|
goto Out;
|
|
if(PAKclient(conn, owner, pass, nil) < 0){
|
|
werrstr("password mistyped?");
|
|
goto Out;
|
|
}
|
|
if(readstr(conn, s) < 0)
|
|
goto Out;
|
|
if(strcmp(s, "STA") == 0){
|
|
sta = readcons("STA PIN+SecureID", nil, 1);
|
|
if(sta==nil || strlen(sta)==0){
|
|
werrstr("cancel");
|
|
goto Out;
|
|
}
|
|
if(strlen(sta) >= sizeof s - 3){
|
|
werrstr("STA response too long");
|
|
goto Out;
|
|
}
|
|
strcpy(s+3, sta);
|
|
conn->write(conn, (uchar*)s, strlen(s));
|
|
readstr(conn, s);
|
|
}
|
|
if(strcmp(s, "OK") !=0){
|
|
werrstr("%s", s);
|
|
goto Out;
|
|
}
|
|
if((rv = getfile(conn, (uchar*)pass, strlen(pass))) == nil)
|
|
goto Out;
|
|
strcpy(bye, "BYE");
|
|
conn->write(conn, (uchar*)bye, 3);
|
|
|
|
Out:
|
|
if(conn)
|
|
conn->free(conn);
|
|
if(pass)
|
|
free(pass);
|
|
if(sta)
|
|
free(sta);
|
|
return rv;
|
|
}
|
|
|