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implement P9export;
include "sys.m";
sys: Sys;
include "draw.m";
include "keyring.m";
include "security.m";
include "factotum.m";
include "encoding.m";
include "arg.m";
P9export: module
{
init: fn(nil: ref Draw->Context, nil: list of string);
};
factotumfile := "/mnt/factotum/rpc";
fail(status, msg: string)
{
sys->fprint(sys->fildes(2), "9export: %s\n", msg);
raise "fail:"+status;
}
nomod(mod: string)
{
fail("load", sys->sprint("can't load %s: %r", mod));
}
init(nil: ref Draw->Context, args: list of string)
{
sys = load Sys Sys->PATH;
arg := load Arg Arg->PATH;
if(arg == nil)
nomod(Arg->PATH);
arg->init(args);
arg->setusage("9export [-aA9] [-k keyspec] [-e enc digest]");
cryptalg := ""; # will be rc4_256 sha1
keyspec := "";
noauth := 0;
xflag := Sys->EXPWAIT;
while((o := arg->opt()) != 0)
case o {
'a' =>
xflag = Sys->EXPASYNC;
'A' =>
noauth = 1;
'e' =>
cryptalg = arg->earg();
if(cryptalg == "clear")
cryptalg = nil;
'k' =>
keyspec = arg->earg();
'9' =>
;
* =>
arg->usage();
}
args = arg->argv();
arg = nil;
sys->pctl(Sys->FORKFD|Sys->FORKNS, nil);
fd := sys->fildes(0);
secret: array of byte;
if(noauth == 0){
factotum := load Factotum Factotum->PATH;
if(factotum == nil)
nomod(Factotum->PATH);
factotum->init();
facfd := sys->open(factotumfile, Sys->ORDWR);
if(facfd == nil)
fail("factotum", sys->sprint("can't open %s: %r", factotumfile));
ai := factotum->proxy(fd, facfd, "proto=p9any role=server "+keyspec);
if(ai == nil)
fail("auth", sys->sprint("can't authenticate 9export: %r"));
secret = ai.secret;
}
# read tree; it's a Plan 9 bug that there's no reliable delimiter
btree := array[2048] of byte;
n := sys->read(fd, btree, len btree);
if(n <= 0)
fail("tree", sys->sprint("can't read tree: %r"));
tree := string btree[0:n];
if(sys->chdir(tree) < 0){
sys->fprint(fd, "chdir(%d:\"%s\"): %r", n, tree);
fail("tree", sys->sprint("bad tree: %s", tree));
}
if(sys->write(fd, array of byte "OK", 2) != 2)
fail("tree", sys->sprint("can't OK tree: %r"));
impo := array[2048] of byte;
for(n = 0; n < len impo; n++)
if(sys->read(fd, impo[n:], 1) != 1)
fail("impo", sys->sprint("can't read impo: %r"));
else if(impo[n] == byte 0 || impo[n] == byte '\n')
break;
if(n < 4 || string impo[0:4] != "impo")
fail("impo", "wasn't impo: possibly old import/cpu");
if(noauth == 0 && cryptalg != nil){
if(secret == nil)
fail("import", "didn't establish shared secret");
random := load Random Random->PATH;
if(random == nil)
nomod(Random->PATH);
kr := load Keyring Keyring->PATH;
if(kr == nil)
nomod(Keyring->PATH);
ssl := load SSL SSL->PATH;
if(ssl == nil)
nomod(SSL->PATH);
base64 := load Encoding Encoding->BASE64PATH;
if(base64 == nil)
nomod(Encoding->BASE64PATH);
key := array[16] of byte; # myrand[4] secret[8] hisrand[4]
key[0:] = random->randombuf(Random->ReallyRandom, 4);
ns := len secret;
if(ns > 8)
ns = 8;
key[12:] = secret[0:ns];
if(sys->write(fd, key[12:], 4) != 4)
fail("import", sys->sprint("can't write key to remote: %r"));
if(readn(fd, key, 4) != 4)
fail("import", sys->sprint("can't read remote key: %r"));
digest := array[Keyring->SHA1dlen] of byte;
kr->sha1(key, len key, digest, nil);
err: string;
(fd, err) = pushssl(fd, base64->dec(S(digest[10:20])), base64->dec(S(digest[0:10])), cryptalg);
if(err != nil)
fail("import", sys->sprint("can't push security layer: %s", err));
}
if(sys->export(fd, ".", xflag) < 0)
fail("export", sys->sprint("can't export %s: %r", tree));
}
readn(fd: ref Sys->FD, buf: array of byte, nb: int): int
{
for(nr := 0; nr < nb;){
n := sys->read(fd, buf[nr:], nb-nr);
if(n <= 0){
if(nr == 0)
return n;
break;
}
nr += n;
}
return nr;
}
S(a: array of byte): string
{
s := "";
for(i:=0; i<len a; i++)
s += sys->sprint("%.2ux", int a[i]);
return s;
}
pushssl(fd: ref Sys->FD, secretin, secretout: array of byte, alg: string): (ref Sys->FD, string)
{
ssl := load SSL SSL->PATH;
if(ssl == nil)
nomod(SSL->PATH);
(err, c) := ssl->connect(fd);
if(err != nil)
return (nil, "can't connect ssl: " + err);
err = ssl->secret(c, secretin, secretout);
if(err != nil)
return (nil, "can't write secret: " + err);
if(sys->fprint(c.cfd, "alg %s", alg) < 0)
return (nil, sys->sprint("can't push algorithm %s: %r", alg));
return (c.dfd, nil);
}
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