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implement Createsignerkey;
include "sys.m";
sys: Sys;
include "draw.m";
include "daytime.m";
include "ipints.m";
include "crypt.m";
crypt: Crypt;
include "oldauth.m";
oldauth: Oldauth;
include "arg.m";
# signer key never expires
SKexpire: con 0;
# size in bits of modulus for public keys
PKmodlen: con 1024;
# size in bits of modulus for diffie hellman
DHmodlen: con 1024;
algs := array[] of {"rsa", "elgamal"}; # first entry is default
Createsignerkey: module
{
init: fn(nil: ref Draw->Context, nil: list of string);
};
init(nil: ref Draw->Context, args: list of string)
{
err: string;
sys = load Sys Sys->PATH;
crypt = load Crypt Crypt->PATH;
oldauth = load Oldauth Oldauth->PATH;
oldauth->init();
arg := load Arg Arg->PATH;
arg->init(args);
arg->setusage("createsignerkey [-a algorithm] [-f keyfile] [-e ddmmyyyy] [-b size-in-bits] name-of-owner");
alg := algs[0];
filename := "/keydb/signerkey";
expire := SKexpire;
bits := PKmodlen;
while((c := arg->opt()) != 0){
case c {
'a' =>
alg = arg->arg();
if(alg == nil)
arg->usage();
for(i:=0;; i++){
if(i >= len algs)
error(sys->sprint("unknown algorithm: %s", alg));
else if(alg == algs[i])
break;
}
'f' or 'k' =>
filename = arg->earg();
'e' =>
s := arg->earg();
(err, expire) = checkdate(s);
if(err != nil)
error(err);
'b' =>
s := arg->earg();
bits = int s;
if(bits < 32 || bits > 4096)
error("modulus must be in the range of 32 to 4096 bits");
* =>
arg->usage();
}
}
args = arg->argv();
if(args == nil)
arg->usage();
arg = nil;
owner := hd args;
# generate a local key, self-signed
info := ref Oldauth->Authinfo;
info.mysk = crypt->genSK(alg, bits);
if(info.mysk == nil)
error(sys->sprint("algorithm %s not configured in system", alg));
info.owner = owner;
info.mypk = crypt->sktopk(info.mysk);
info.spk = crypt->sktopk(info.mysk);
myPKbuf := array of byte oldauth->pktostr(info.mypk, owner);
state := crypt->sha1(myPKbuf, len myPKbuf, nil, nil);
info.cert = oldauth->sign(info.mysk, owner, expire, state, "sha1");
(info.alpha, info.p) = crypt->dhparams(DHmodlen);
if(oldauth->writeauthinfo(filename, info) < 0)
error(sys->sprint("can't write signerkey file %s: %r", filename));
}
error(s: string)
{
sys->fprint(sys->fildes(2), "createsignerkey: %s\n", s);
raise "fail:error";
}
checkdate(word: string): (string, int)
{
if(len word != 8)
return ("!date must be in form ddmmyyyy", 0);
daytime := load Daytime Daytime->PATH;
now := daytime->now();
tm := daytime->local(now);
tm.sec = 59;
tm.min = 59;
tm.hour = 24;
tm.mday = int word[0:2];
if(tm.mday > 31 || tm.mday < 1)
return ("!bad day of month", 0);
tm.mon = int word[2:4] - 1;
if(tm.mon > 11 || tm.mday < 0)
return ("!bad month", 0);
tm.year = int word[4:8] - 1900;
if(tm.year < 70)
return ("!bad year", 0);
newdate := daytime->tm2epoch(tm);
if(newdate < now)
return ("!expiration date must be in the future", 0);
return (nil, newdate);
}
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