ref: 370c2a5ee086243da420e5c569b10880d85c05e2
dir: /p9any.c/
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <u.h>
#include <args.h>
#include <libc.h>
#include <auth.h>
#include <authsrv.h>
#include <libsec.h>
#include "fncs.h"
char*
estrdup(char *s)
{
s = strdup(s);
if(s == nil)
sysfatal("out of memory");
return s;
}
int
unix_dial(char *host, char *port)
{
struct addrinfo hints, *res, *res0;
int error;
int save_errno;
int s;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo(host, port, &hints, &res0);
if(error){
printf("could not resolve %s", host);
return -1;
}
s = -1;
for (res = res0; res; res = res->ai_next) {
s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s == -1) {
continue;
}
if (connect(s, res->ai_addr, res->ai_addrlen) == -1) {
save_errno = errno;
close(s);
errno = save_errno;
s = -1;
continue;
}
break; /* okay we got one */
}
return s;
}
static int
getkey(Authkey *key, char *user, char *dom, char *proto, char *pass)
{
if(pass != nil && *pass)
pass = estrdup(pass);
else {
printf("getkey: no password");
return 0;
}
if(pass != nil){
memset(key, 0, sizeof(*key));
passtokey(key, pass);
if(strcmp(proto, "dp9ik") == 0) {
authpak_hash(key, user);
}
return 1;
}
return 0;
}
int
authdial(char *net, char *dom)
{
return unix_dial(authserver, "567");
}
static int
getastickets(Authkey *key, Ticketreq *tr, uchar *y, char *tbuf, int tbuflen)
{
int asfd, rv;
char *dom;
dom = tr->authdom;
asfd = authdial(nil, dom);
if(asfd < 0)
return -1;
if(y != nil){
PAKpriv p;
rv = -1;
tr->type = AuthPAK;
if(_asrequest(asfd, tr) != 0 || write(asfd, y, PAKYLEN) != PAKYLEN)
goto Out;
authpak_new(&p, key, (uchar*)tbuf, 1);
if(write(asfd, tbuf, PAKYLEN) != PAKYLEN)
goto Out;
if(_asrdresp(asfd, tbuf, 2*PAKYLEN) != 2*PAKYLEN)
goto Out;
memmove(y, tbuf, PAKYLEN);
if(authpak_finish(&p, key, (uchar*)tbuf+PAKYLEN))
goto Out;
}
tr->type = AuthTreq;
rv = _asgetticket(asfd, tr, tbuf, tbuflen);
Out:
close(asfd);
return rv;
}
static int
mkservertickets(Authkey *key, Ticketreq *tr, uchar *y, char *tbuf, int tbuflen)
{
Ticket t;
int ret;
if(strcmp(tr->authid, tr->hostid) != 0)
return -1;
memset(&t, 0, sizeof(t));
ret = 0;
if(y != nil){
PAKpriv p;
t.form = 1;
memmove(tbuf, y, PAKYLEN);
authpak_new(&p, key, y, 0);
authpak_finish(&p, key, (uchar*)tbuf);
}
memmove(t.chal, tr->chal, CHALLEN);
strcpy(t.cuid, tr->uid);
strcpy(t.suid, tr->uid);
genrandom((uchar*)t.key, sizeof(t.key));
t.num = AuthTc;
ret += convT2M(&t, tbuf+ret, tbuflen-ret, key);
t.num = AuthTs;
ret += convT2M(&t, tbuf+ret, tbuflen-ret, key);
memset(&t, 0, sizeof(t));
return ret;
}
static int
gettickets(Authkey *key, Ticketreq *tr, uchar *y, char *tbuf, int tbuflen)
{
int ret;
ret = getastickets(key, tr, y, tbuf, tbuflen);
if(ret > 0)
return ret;
return mkservertickets(key, tr, y, tbuf, tbuflen);
}
int
readstr(int fd, char *str, int len)
{
int n;
while(len) {
n = read(fd, str, 1);
if(n < 0)
return -1;
if(*str == '\0')
return 0;
str++;
len--;
}
return -1;
}
AuthInfo*
p9any(char *user, char *pass, int fd)
{
char buf[1024], buf2[1024], *bbuf, *p, *proto, *dom;
uchar crand[2*NONCELEN], cchal[CHALLEN], y[PAKYLEN];
char tbuf[2*MAXTICKETLEN+MAXAUTHENTLEN+PAKYLEN], trbuf[TICKREQLEN+PAKYLEN];
Authkey authkey;
Authenticator auth;
int i, n, m, v2, dp9ik;
Ticketreq tr;
Ticket t;
AuthInfo *ai;
if(readstr(fd, buf, sizeof buf) < 0){
printf("cannot read p9any negotiation");
return nil;
}
bbuf = buf;
v2 = 0;
if(strncmp(buf, "v.2 ", 4) == 0){
v2 = 1;
bbuf += 4;
}
dp9ik = 0;
proto = nil;
while(bbuf != nil){
if((p = strchr(bbuf, ' ')))
*p++ = 0;
if((dom = strchr(bbuf, '@')) == nil){
printf("bad p9any domain");
return nil;
}
*dom++ = 0;
if(strcmp(bbuf, "p9sk1") == 0 || strcmp(bbuf, "dp9ik") == 0){
proto = bbuf;
if(strcmp(proto, "dp9ik") == 0){
dp9ik = 1;
break;
}
}
bbuf = p;
}
if(proto == nil){
printf("server did not offer p9sk1 or dp9ik");
return nil;
}
proto = estrdup(proto);
sprint(buf2, "%s %s", proto, dom);
if(write(fd, buf2, strlen(buf2)+1) != strlen(buf2)+1){
printf("cannot write user/domain choice in p9any");
return nil;
}
if(v2){
if(readstr(fd, buf, sizeof buf) < 0){
printf("cannot read OK in p9any");
return nil;
}
if(memcmp(buf, "OK\0", 3) != 0){
printf("did not get OK in p9any: got %s", buf);
return nil;
}
}
genrandom(crand, 2*NONCELEN);
genrandom(cchal, CHALLEN);
if(write(fd, cchal, CHALLEN) != CHALLEN){
printf("cannot write p9sk1 challenge");
return nil;
}
n = TICKREQLEN;
if(dp9ik)
n += PAKYLEN;
if(readn(fd, trbuf, n) != n || convM2TR(trbuf, TICKREQLEN, &tr) <= 0){
printf("cannot read ticket request in p9sk1");
return nil;
}
again:
if(!getkey(&authkey, user, tr.authdom, proto, pass)){
printf("no password");
return nil;
}
strecpy(tr.hostid, tr.hostid+sizeof tr.hostid, user);
strecpy(tr.uid, tr.uid+sizeof tr.uid, user);
if(dp9ik){
memmove(y, trbuf+TICKREQLEN, PAKYLEN);
n = gettickets(&authkey, &tr, y, tbuf, sizeof(tbuf));
} else {
n = gettickets(&authkey, &tr, nil, tbuf, sizeof(tbuf));
}
if(n <= 0){
printf("cannot get auth tickets in p9sk1");
return nil;
}
m = convM2T(tbuf, n, &t, &authkey);
if(m <= 0 || t.num != AuthTc){
printf("?password mismatch with auth server\n");
if(pass != nil && *pass){
printf("wrong password");
return nil;
}
goto again;
}
n -= m;
memmove(tbuf, tbuf+m, n);
if(dp9ik && write(fd, y, PAKYLEN) != PAKYLEN){
printf("cannot send authpak public key back");
return nil;
}
auth.num = AuthAc;
memmove(auth.rand, crand, NONCELEN);
memmove(auth.chal, tr.chal, CHALLEN);
m = convA2M(&auth, tbuf+n, sizeof(tbuf)-n, &t);
n += m;
if(write(fd, tbuf, n) != n){
printf("cannot send ticket and authenticator back");
return nil;
}
if((n=read(fd, tbuf, m)) != m || memcmp(tbuf, "cpu:", 4) == 0){
if(n <= 4){
printf("cannot read authenticator");
return nil;
}
/*
* didn't send back authenticator:
* sent back fatal error message.
*/
memmove(buf, tbuf, n);
i = readn(fd, buf+n, sizeof buf-n-1);
if(i > 0)
n += i;
buf[n] = 0;
printf("server says: %s", buf);
return nil;
}
if(convM2A(tbuf, n, &auth, &t) <= 0
|| auth.num != AuthAs || tsmemcmp(auth.chal, cchal, CHALLEN) != 0){
print("?you and auth server agree about password.\n");
print("?server is confused.\n");
return nil;
}
memmove(crand+NONCELEN, auth.rand, NONCELEN);
// print("i am %s there.\n", t.suid);
ai = mallocz(sizeof(AuthInfo), 1);
ai->suid = estrdup(t.suid);
ai->cuid = estrdup(t.cuid);
if(dp9ik){
static char info[] = "Plan 9 session secret";
ai->nsecret = 256;
ai->secret = mallocz(ai->nsecret, 1);
hkdf_x( crand, 2*NONCELEN,
(uchar*)info, sizeof(info)-1,
(uchar*)t.key, NONCELEN,
ai->secret, ai->nsecret,
hmac_sha2_256, SHA2_256dlen);
} else {
ai->nsecret = 8;
ai->secret = mallocz(ai->nsecret, 1);
des56to64((uchar*)t.key, ai->secret);
}
memset(&t, 0, sizeof(t));
memset(&auth, 0, sizeof(auth));
memset(&authkey, 0, sizeof(authkey));
memset(cchal, 0, sizeof(cchal));
memset(crand, 0, sizeof(crand));
free(proto);
return ai;
}