ref: 7a503757b1251c2746df7bdcd891814c1518cc28
dir: /sys/src/cmd/auth/factotum/fs.c/
#include "dat.h"
int askforkeys = 1;
char *authaddr[8];
int debug;
int doprivate = 1;
int gflag;
char *owner;
int kflag;
char *mtpt = "/mnt";
Keyring *ring;
char *service;
int sflag;
int uflag;
extern Srv fs;
static void notifyf(void*, char*);
static void private(void);
char Easproto[] = "auth server protocol botch";
char Ebadarg[] = "invalid argument";
char Ebadkey[] = "bad key";
char Enegotiation[] = "negotiation failed, no common protocols or keys";
char Etoolarge[] = "rpc too large";
Proto*
prototab[] =
{
&apop,
&chap,
&cram,
&httpdigest,
&mschap,
&mschapv2,
&ntlm,
&ntlmv2,
&p9any,
&p9cr,
&p9sk1,
&dp9ik,
&pass,
&rsa,
&vnc,
&ecdsa,
&wpapsk,
nil,
};
void
usage(void)
{
fprint(2, "usage: %s [-DSdknpu] [-a authaddr] [-m mtpt] [-s service]\n",
argv0);
fprint(2, "or %s -g 'params'\n", argv0);
exits("usage");
}
void
main(int argc, char **argv)
{
int i, trysecstore;
char *s;
Dir d;
Proto *p;
trysecstore = 1;
ARGBEGIN{
case 'D':
chatty9p++;
break;
case 'S': /* server: read nvram, no prompting for keys */
askforkeys = 0;
trysecstore = 0;
sflag = 1;
break;
case 'a':
for(i=0; i < nelem(authaddr)-2 && authaddr[i] != nil; i++)
;
authaddr[i] = EARGF(usage());
break;
case 'd':
debug = 1;
doprivate = 0;
break;
case 'g': /* get: prompt for key for name and domain */
gflag = 1;
break;
case 'k': /* reinitialize nvram */
kflag = 1;
break;
case 'm': /* set default mount point */
mtpt = EARGF(usage());
break;
case 'n':
trysecstore = 0;
break;
case 'p':
doprivate = 0;
break;
case 's': /* set service name */
service = EARGF(usage());
break;
case 'u': /* user: set hostowner */
uflag = 1;
break;
default:
usage();
}ARGEND
if(argc != 0 && !gflag)
usage();
if(doprivate)
private();
initcap();
quotefmtinstall();
fmtinstall('A', _attrfmt);
fmtinstall('N', attrnamefmt);
fmtinstall('H', encodefmt);
ring = emalloc(sizeof(*ring));
notify(notifyf);
if(gflag){
if(argc != 1)
usage();
askuser(argv[0]);
exits(nil);
}
for(i=0; prototab[i]; i++){
p = prototab[i];
if(p->name == nil)
sysfatal("protocol %d has no name", i);
if(p->init == nil)
sysfatal("protocol %s has no init", p->name);
if(p->write == nil)
sysfatal("protocol %s has no write", p->name);
if(p->read == nil)
sysfatal("protocol %s has no read", p->name);
if(p->close == nil)
sysfatal("protocol %s has no close", p->name);
if(p->keyprompt == nil)
p->keyprompt = "";
}
if(sflag){
if(getnvramkey(kflag ? NVwrite : NVwriteonerr) < 0)
fprint(2, "factotum warning: cannot read nvram: %r\n");
} else if(uflag)
promptforhostowner();
owner = getuser();
postmountsrv(&fs, service, mtpt, MBEFORE);
if(service){
nulldir(&d);
d.mode = 0666;
s = emalloc(10+strlen(service));
strcpy(s, "/srv/");
strcat(s, service);
if(dirwstat(s, &d) < 0)
fprint(2, "factotum warning: cannot chmod 666 %s: %r\n", s);
free(s);
}
if(trysecstore){
if(fork() == 0){
int fd;
if((fd = open(smprint("%s/factotum/ctl", mtpt), OWRITE)) < 0)
sysfatal("can't open factotum: %r");
dup(fd, 1);
execl("/bin/auth/secstore", "secstore", "-G", "factotum", nil);
exits(nil);
}
waitpid();
}
exits(nil);
}
/* don't allow other processes to debug us and steal keys */
static void
private(void)
{
int fd;
char buf[32];
static char pmsg[] = "Warning! %s can't protect itself from debugging: %r\n";
static char smsg[] = "Warning! %s can't turn off swapping: %r\n";
snprint(buf, sizeof(buf), "/proc/%d/ctl", getpid());
fd = open(buf, OWRITE|OCEXEC);
if(fd < 0){
fprint(2, pmsg, argv0);
return;
}
if(fprint(fd, "private") < 0)
fprint(2, pmsg, argv0);
if(fprint(fd, "noswap") < 0)
fprint(2, smsg, argv0);
close(fd);
}
static void
notifyf(void*, char *s)
{
if(strncmp(s, "interrupt", 9) == 0 || strncmp(s, "alarm", 5) == 0)
noted(NCONT);
noted(NDFLT);
}
enum
{
Qroot,
Qfactotum,
Qrpc,
Qkeylist,
Qprotolist,
Qconfirm,
Qlog,
Qctl,
Qneedkey,
};
Qid
mkqid(int type, int path)
{
Qid q;
q.type = type;
q.path = path;
q.vers = 0;
return q;
}
static void
fsattach(Req *r)
{
r->fid->qid = mkqid(QTDIR, Qroot);
r->ofcall.qid = r->fid->qid;
respond(r, nil);
}
static struct {
char *name;
int qidpath;
ulong perm;
} dirtab[] = {
"confirm", Qconfirm, 0600|DMEXCL, /* we know this is slot #0 below */
"needkey", Qneedkey, 0600|DMEXCL, /* we know this is slot #1 below */
"ctl", Qctl, 0644,
"rpc", Qrpc, 0666,
"proto", Qprotolist, 0444,
"log", Qlog, 0400|DMEXCL,
};
static int inuse[nelem(dirtab)];
int *confirminuse = &inuse[0];
int *needkeyinuse = &inuse[1];
static void
fillstat(Dir *dir, char *name, int type, int path, ulong perm)
{
dir->name = estrdup(name);
dir->uid = estrdup(owner);
dir->gid = estrdup(owner);
dir->mode = perm;
dir->length = 0;
dir->qid = mkqid(type, path);
dir->atime = time(0);
dir->mtime = time(0);
dir->muid = estrdup("");
}
static int
rootdirgen(int n, Dir *dir, void*)
{
if(n > 0)
return -1;
fillstat(dir, "factotum", QTDIR, Qfactotum, DMDIR|0555);
return 0;
}
static int
fsdirgen(int n, Dir *dir, void*)
{
if(n >= nelem(dirtab))
return -1;
fillstat(dir, dirtab[n].name, 0, dirtab[n].qidpath, dirtab[n].perm);
return 0;
}
static char*
fswalk1(Fid *fid, char *name, Qid *qid)
{
int i;
switch((ulong)fid->qid.path){
default:
return "cannot happen";
case Qroot:
if(strcmp(name, "factotum") == 0){
*qid = mkqid(QTDIR, Qfactotum);
fid->qid = *qid;
return nil;
}
if(strcmp(name, "..") == 0){
*qid = fid->qid;
return nil;
}
return "not found";
case Qfactotum:
for(i=0; i<nelem(dirtab); i++)
if(strcmp(name, dirtab[i].name) == 0){
*qid = mkqid(0, dirtab[i].qidpath);
fid->qid = *qid;
return nil;
}
if(strcmp(name, "..") == 0){
*qid = mkqid(QTDIR, Qroot);
fid->qid = *qid;
return nil;
}
return "not found";
}
}
static void
fsstat(Req *r)
{
int i;
ulong path;
path = r->fid->qid.path;
if(path == Qroot){
fillstat(&r->d, "/", QTDIR, Qroot, 0555|DMDIR);
respond(r, nil);
return;
}
if(path == Qfactotum){
fillstat(&r->d, "factotum", QTDIR, Qfactotum, 0555|DMDIR);
respond(r, nil);
return;
}
for(i=0; i<nelem(dirtab); i++)
if(dirtab[i].qidpath == path){
fillstat(&r->d, dirtab[i].name, 0, dirtab[i].qidpath, dirtab[i].perm);
respond(r, nil);
return;
}
respond(r, "file not found");
}
static void
fsopen(Req *r)
{
int i, *p, perm;
static int need[4] = {4, 2, 6, 1};
int n;
Fsstate *fss;
p = nil;
for(i=0; i<nelem(dirtab); i++)
if(dirtab[i].qidpath == r->fid->qid.path)
break;
if(i < nelem(dirtab)){
if(dirtab[i].perm & DMEXCL)
p = &inuse[i];
if(strcmp(r->fid->uid, owner) == 0)
perm = dirtab[i].perm>>6;
else
perm = dirtab[i].perm;
}else
perm = 5;
n = need[r->ifcall.mode&3];
if((r->ifcall.mode&~(3|OTRUNC)) || ((perm&n) != n)){
respond(r, "permission denied");
return;
}
if(p){
if(*p){
respond(r, "file in use");
return;
}
(*p)++;
}
r->fid->aux = fss = emalloc(sizeof(Fsstate));
fss->phase = Notstarted;
fss->sysuser = r->fid->uid;
fss->attr = nil;
strcpy(fss->err, "factotum/fs.c no error");
respond(r, nil);
}
static void
fsdestroyfid(Fid *fid)
{
int i;
Fsstate *fss;
if(fid->omode != -1){
for(i=0; i<nelem(dirtab); i++)
if(dirtab[i].qidpath == fid->qid.path)
if(dirtab[i].perm&DMEXCL)
inuse[i] = 0;
}
fss = fid->aux;
if(fss == nil)
return;
qlock(fss);
if(fss->ps)
(*fss->proto->close)(fss);
_freeattr(fss->attr);
qunlock(fss);
free(fss);
}
static int
readlist(int off, int (*gen)(int, char*, uint, Fsstate*), Req *r, Fsstate *fss)
{
char *a, *ea;
int n;
a = r->ofcall.data;
ea = a+r->ifcall.count;
for(;;){
n = (*gen)(off, a, ea-a, fss);
if(n == 0){
r->ofcall.count = a - (char*)r->ofcall.data;
return off;
}
a += n;
off++;
}
}
enum { Nearend = 2, }; /* at least room for \n and NUL */
/* result in `a', of `n' bytes maximum */
static int
keylist(int i, char *a, uint n, Fsstate *fss)
{
int wb;
Keyinfo ki;
Key *k;
k = nil;
mkkeyinfo(&ki, fss, nil);
ki.attr = nil;
ki.noconf = 1;
ki.skip = i;
ki.usedisabled = 1;
if(findkey(&k, &ki, nil) != RpcOk)
return 0;
memset(a + n - Nearend, 0, Nearend);
wb = snprint(a, n, "key %A %N\n", k->attr, k->privattr);
closekey(k);
if (wb >= n - 1 && a[n - 2] != '\n' && a[n - 2] != '\0') {
/* line won't fit in `a', so just truncate */
strcpy(a + n - 2, "\n");
return 0;
}
return wb;
}
static int
protolist(int i, char *a, uint n, Fsstate *fss)
{
USED(fss);
if(i >= nelem(prototab)-1)
return 0;
if(strlen(prototab[i]->name)+1 > n)
return 0;
n = strlen(prototab[i]->name)+1;
memmove(a, prototab[i]->name, n-1);
a[n-1] = '\n';
return n;
}
static void
fsrpcio(Req *r)
{
Fsstate *fss;
Srv *srv;
fss = r->fid->aux;
srv = r->srv;
if(srv->sref.ref == 1 && srv->rref.ref > 16){
respond(r, "too much activity");
return;
}
srvrelease(srv);
qlock(fss);
if(r->ifcall.type == Tread)
rpcread(r);
else
rpcwrite(r);
qunlock(fss);
srvacquire(srv);
}
static void
fsread(Req *r)
{
Fsstate *s;
s = r->fid->aux;
switch((ulong)r->fid->qid.path){
default:
respond(r, "bug in fsread");
break;
case Qroot:
dirread9p(r, rootdirgen, nil);
respond(r, nil);
break;
case Qfactotum:
dirread9p(r, fsdirgen, nil);
respond(r, nil);
break;
case Qrpc:
fsrpcio(r);
break;
case Qneedkey:
needkeyread(r);
break;
case Qconfirm:
confirmread(r);
break;
case Qlog:
logread(r);
break;
case Qctl:
s->listoff = readlist(s->listoff, keylist, r, s);
respond(r, nil);
break;
case Qprotolist:
s->listoff = readlist(s->listoff, protolist, r, s);
respond(r, nil);
break;
}
}
static void
fswrite(Req *r)
{
int ret;
char err[ERRMAX], *s;
switch((ulong)r->fid->qid.path){
default:
respond(r, "bug in fswrite");
break;
case Qrpc:
fsrpcio(r);
break;
case Qneedkey:
case Qconfirm:
case Qctl:
s = emalloc(r->ifcall.count+1);
memmove(s, r->ifcall.data, r->ifcall.count);
s[r->ifcall.count] = '\0';
switch((ulong)r->fid->qid.path){
default:
abort();
case Qneedkey:
ret = needkeywrite(r->srv, s);
break;
case Qconfirm:
ret = confirmwrite(r->srv, s);
break;
case Qctl:
ret = ctlwrite(s, 0);
break;
}
free(s);
if(ret < 0){
rerrstr(err, sizeof err);
respond(r, err);
}else{
r->ofcall.count = r->ifcall.count;
respond(r, nil);
}
break;
}
}
static void
fsflush(Req *r)
{
confirmflush(r->oldreq);
needkeyflush(r->oldreq);
logflush(r->oldreq);
respond(r, nil);
}
Srv fs = {
.attach= fsattach,
.walk1= fswalk1,
.open= fsopen,
.read= fsread,
.write= fswrite,
.stat= fsstat,
.flush= fsflush,
.destroyfid= fsdestroyfid,
};