ref: 345714dd56f5da8dcb2193f9cdf041cfc005d82f
dir: /sys/src/cmd/auth/asaudit.c/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <mp.h>
#include <libsec.h>
#include <auth.h>
#include <authsrv.h>
#include <ndb.h>
int havenvram, havekeyfs;
Nvrsafe nvr;
uchar keyfskey[AESKEYLEN];
char eve[128];
Ndb *db;
void
geteve(void)
{
int fd;
fd = open("#c/hostowner", OREAD);
if(fd < 0) sysfatal("open: %r");
memset(eve, 0, sizeof(eve));
if(read(fd, eve, sizeof(eve)-1) < 0) sysfatal("read: %r");
close(fd);
if(strcmp(getuser(), eve) != 0) print("hostowner is %#q, but running as %#q\n", eve, getuser());
}
void
ndb(void)
{
db = ndbopen(nil);
if(db == nil){
print("ndbopen: %r\n");
return;
}
}
void
nvram(void)
{
char *auth;
if(readnvram(&nvr, 0) < 0){
print("readnvram: %r\n");
return;
}
havenvram = 1;
print("GOOD: found nvram key for user '%s@%s'\n", nvr.authid, nvr.authdom);
if(strcmp(eve, nvr.authid) != 0) print("BAD: nvram authid doesn't match hostowner %#q\n", eve);
if(db != nil){
auth = ndbgetvalue(db, nil, "authdom", nvr.authdom, "auth", nil);
if(auth == nil) print("BAD: authdom %#q not found in ndb\n", nvr.authdom);
else{
print("ndb says authdom %#q corresponds to auth server %#q\n", nvr.authdom, auth);
free(auth);
}
}
}
void
keyfs(void)
{
char *buf;
int fd;
char aes[AESKEYLEN];
if(!havenvram) return;
if(access("/adm/keys", AREAD) < 0){
print("no access to /adm/keys\n");
return;
}
print("starting keyfs\n");
rfork(RFNAMEG);
switch(fork()){
case -1:
sysfatal("fork: %r");
case 0:
if(execl("/bin/auth/keyfs", "auth/keyfs", "-r", nil) < 0)
sysfatal("execl: %r");
}
waitpid();
buf = smprint("/mnt/keys/%s/aeskey", nvr.authid);
fd = open(buf, OREAD);
if(fd < 0){
print("BAD: can't get key from keyfs: %r\n");
return;
}
werrstr("short read");
if(read(fd, aes, sizeof(aes)) < sizeof(aes)){
print("read: %r\n");
close(fd);
return;
}
havekeyfs = 1;
memmove(keyfskey, aes, AESKEYLEN);
if(memcmp(nvr.aesmachkey, aes, AESKEYLEN) != 0)
print("BAD: key in keyfs does not match nvram\n");
else
print("GOOD: key in keyfs matches nvram\n");
close(fd);
}
int
checkkey(void)
{
Biobuf *bp;
Attr *at, *ap;
char *l;
int proto, dom, user;
bp = Bopen("/mnt/factotum/ctl", OREAD);
if(bp == nil){
print("can't open /mnt/factotum/ctl: %r\n");
return 0;
}
proto = dom = user = 0;
while(l = Brdstr(bp, '\n', 1), l != nil){
if(strncmp(l, "key ", 4) != 0) continue;
at = _parseattr(l + 4);
free(l);
proto = dom = user = 0;
for(ap = at; ap != nil; ap = ap->next){
if(strcmp(ap->name, "proto") == 0 && strcmp(ap->val, "dp9ik") == 0)
proto++;
if(strcmp(ap->name, "dom") == 0 && strcmp(ap->val, nvr.authdom) == 0)
dom++;
if(strcmp(ap->name, "user") == 0 && strcmp(ap->val, nvr.authid) == 0)
user++;
if(strcmp(ap->name, "disabled") == 0){
proto = dom = user = 0;
break;
}
}
_freeattr(at);
if(proto && dom && user)
break;
}
Bterm(bp);
if(!proto || !dom || !user){
print("can't test factotum key: no key for '%s@%s' in factotum\n", nvr.authdom, nvr.authid);
return 0;
}
return 1;
}
int
trykey(int keyfs)
{
int fd, rc;
AuthRpc *rpc;
Authkey ak;
PAKpriv pr;
Ticketreq tr;
Ticket t;
Authenticator a;
char *s;
uchar chal[CHALLEN], paky[PAKYLEN];
char tick[MAXTICKETLEN+MAXAUTHENTLEN];
char errbuf[ERRMAX];
char *source;
source = keyfs ? "keyfs" : "nvram";
fd = open("/mnt/factotum/rpc", ORDWR);
if(fd < 0){ print("open: %r\n"); return -1; }
print("trying %s key for %s@%s with factotum\n", source, nvr.authdom, nvr.authid);
rpc = auth_allocrpc(fd);
if(rpc == nil){ print("auth_allocrpc: %r\n"); return -1; }
s = smprint("proto=dp9ik dom=%q user=%q role=server", nvr.authdom, nvr.authid);
if(auth_rpc(rpc, "start", s, strlen(s)) != ARok){ print("auth_rpc start: %r\n"); goto err; }
free(s);
genrandom(chal, CHALLEN);
if(auth_rpc(rpc, "write", chal, CHALLEN) != ARok){ print("BAD: auth_rpc write challenge: %r\n"); goto err; }
if(auth_rpc(rpc, "read", nil, 0) != ARok){ print("BAD: auth_rpc read ticket request: %r\n"); goto err; }
rc = convM2TR(rpc->arg, rpc->narg, &tr);
memset(&ak, 0, sizeof(ak));
memmove(ak.aes, nvr.aesmachkey, AESKEYLEN);
authpak_hash(&ak, nvr.authid);
authpak_new(&pr, &ak, paky, 0);
authpak_finish(&pr, &ak, (uchar *)rpc->arg + rc);
if(auth_rpc(rpc, "write", paky, PAKYLEN) != ARok){ print("BAD: auth_rpc write public key: %r\n"); goto err; }
t.num = AuthTs;
memmove(t.chal, tr.chal, CHALLEN);
strcpy(t.cuid, nvr.authid);
strcpy(t.suid, nvr.authid);
genrandom(t.key, sizeof(t.key));
t.form = 1;
rc = convT2M(&t, tick, MAXTICKETLEN, &ak);
a.num = AuthAc;
memmove(a.chal, tr.chal, CHALLEN);
genrandom(a.rand, NONCELEN);
rc += convA2M(&a, tick+rc, MAXAUTHENTLEN, &t);
if(auth_rpc(rpc, "write", tick, rc) != ARok){
rerrstr(errbuf, sizeof(errbuf));
if(strcmp(errbuf, "auth server protocol botch") == 0)
print("BAD: factotum key doesn't seem to match %s (auth_rpc write ticket+authenticator: %r)\n", source);
else
print("BAD: auth_rpc write ticket+authenticator: %r\n");
goto err;
}
if(auth_rpc(rpc, "read", nil, 0) != ARok){ print("BAD: auth_rpc read authenticator: %r\n"); goto err; }
if(convM2A(rpc->arg, rpc->narg, &a, &t) <= 0) goto botch;
if(a.num != AuthAs || memcmp(a.chal, chal, CHALLEN) != 0) goto botch;
print("GOOD: key in factotum matches %s\n", source);
auth_freerpc(rpc);
close(fd);
return 0;
botch:
print("BAD: factotum: protocol botch\n");
err:
auth_freerpc(rpc);
close(fd);
return -1;
}
void
factotum(void)
{
if(!havenvram || !checkkey()) return;
if(trykey(0) < 0 && havekeyfs && memcmp(keyfskey, nvr.aesmachkey, AESKEYLEN) != 0)
trykey(1);
}
void
main()
{
quotefmtinstall();
geteve();
ndb();
nvram();
keyfs();
factotum();
}