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implement Authproto;
include "sys.m";
sys: Sys;
Rread, Rwrite: import Sys;
include "draw.m";
include "keyring.m";
include "bufio.m";
include "sexprs.m";
sexprs: Sexprs;
Sexp: import sexprs;
include "spki.m";
spki: SPKI;
include "../authio.m";
authio: Authio;
Aattr, Aval, Aquery: import Authio;
Attr, IO, Key, Authinfo: import authio;
# queries to handle:
# are you a member of group X?
# are you group leader of group X?
Debug: con 0;
# init, addkey, closekey, write, read, close, keyprompt
Query: adt {
e: ref Sexp;
certs: list of ref Sexp;
gotcerts: list of ref Sexp;
parse: fn(se: ref Sexp): (ref Query, string);
neededcert: fn(q: self ref Query): ref Sexp;
addcert: fn(q: self ref Query, cert: ref Sexp): string;
result: fn(q: self ref Query): ref Sexp;
};
Read: adt {
buf: array of byte;
ptr: int;
off: int;
io: ref IO;
new: fn(io: ref IO): ref Read;
getb: fn(r: self ref Read): int;
ungetb: fn(r: self ref Read): int;
offset: fn(r: self ref Read): big;
};
Maxmsg: con 4000;
init(f: Authio): string
{
authio = f;
sys = load Sys Sys->PATH;
spki = load SPKI SPKI->PATH;
spki->init();
sexprs = load Sexprs Sexprs->PATH;
sexprs->init();
return nil;
}
interaction(attrs: list of ref Attr, io: ref IO): string
{
case authio->lookattrval(attrs, "role") {
"client" =>
return client(attrs, io);
"server" =>
return server(attrs, io);
* =>
return "unknown role";
}
}
client(attrs: list of ref Attr, io: ref IO): string
{
(sexp, nil, err) := Sexp.parse(authio->lookattrval(attrs, "query"));
if(sexp == nil || err != nil)
raise sys->sprint("bad or empty query %q: %s", authio->lookattrval(attrs, "query"), err);
for(;;){
write(io, sexp.pack());
(sexp, err) = Sexp.read(Read.new(io));
if(err != nil)
return "authquery: bad query: "+err;
if(sexp == nil)
return "authquery: no result";
if(sexp.op() != "needcert"){
io.done(ref Authinfo(nil, nil, nil, sexp.pack())); # XXX use something other than secret
return nil;
}
(sexp, err) = needcert(io, sexp);
if(sexp == nil)
return "authquery: no cert: "+err;
}
}
server(nil: list of ref Attr, io: ref IO): string
{
(sexp, err) := Sexp.read(Read.new(io));
if(err != nil)
return "authquery: bad query sexp: "+err;
q: ref Query;
(q, err) = Query.parse(sexp);
if(q == nil)
return "authquery: bad query: "+err;
while((sexp = q.neededcert()) != nil){
write(io, sexp.pack());
(sexp, err) = Sexp.read(Read.new(io));
if(err != nil)
return "authquery: bad cert sexp: "+err;
if((err = q.addcert(sexp)) != nil)
return "authquery: bad certificate received: "+err;
}
write(io, q.result().pack());
io.done(ref Authinfo);
return nil;
}
mkop(op: string, els: list of ref Sexp): ref Sexp
{
return ref Sexp.List(ref Sexp.String(op, nil) :: els);
}
needcert(nil: ref IO, se: ref Sexp): (ref Sexp, string)
{
return (mkop("cert", se :: nil), nil);
# (key, err) := io.findkey(
}
write(io: ref IO, buf: array of byte)
{
while(len buf > Maxmsg){
io.write(buf[0:Maxmsg], Maxmsg);
buf = buf[Maxmsg:];
}
io.write(buf, len buf);
}
Query.parse(sexp: ref Sexp): (ref Query, string)
{
if(!sexp.islist())
return (nil, "query must be a list");
return (ref Query(sexp, sexp.els(), nil), nil);
}
Query.neededcert(q: self ref Query): ref Sexp
{
if(q.certs == nil)
return nil;
c := hd q.certs;
q.certs = tl q.certs;
if(c.op() != "cert")
return nil;
for(a := c.args(); a != nil; a = tl a)
if((hd a).op() == "delay" && (hd a).args() != nil)
sys->sleep(int (hd (hd a).args()).astext());
return mkop("needcert", c :: nil);
}
Query.addcert(q: self ref Query, cert: ref Sexp): string
{
q.gotcerts = cert :: q.gotcerts;
return nil;
}
Query.result(q: self ref Query): ref Sexp
{
return mkop("result", q.gotcerts);
}
Read.new(io: ref IO): ref Read
{
return ref Read(nil, 0, 0, io);
}
Read.getb(r: self ref Read): int
{
if(r.ptr >= len r.buf){
while((buf := r.io.read()) == nil || len buf == 0)
r.io.toosmall(Maxmsg);
r.buf = buf;
r.ptr = 0;
}
r.off++;
return int r.buf[r.ptr++];
}
Read.ungetb(r: self ref Read): int
{
if(r.buf == nil || r.ptr == 0)
return -1;
r.off--;
return int r.buf[--r.ptr];
}
Read.offset(r: self ref Read): big
{
return big r.off;
}
keycheck(nil: ref Authio->Key): string
{
return nil;
}
|
