1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
|
implement Listen;
#
# Copyright © 2003 Vita Nuova Holdings Limited. All rights reserved.
#
include "sys.m";
sys: Sys;
include "draw.m";
include "arg.m";
include "keyring.m";
keyring: Keyring;
include "dial.m";
dial: Dial;
include "security.m";
auth: Auth;
include "sh.m";
sh: Sh;
Context: import sh;
include "registries.m";
registries: Registries;
Registry, Attributes: import registries;
Listen: module {
init: fn(nil: ref Draw->Context, argv: list of string);
};
badmodule(p: string)
{
sys->fprint(stderr(), "listen: cannot load %s: %r\n", p);
raise "fail:bad module";
}
serverkey: ref Keyring->Authinfo;
verbose := 0;
registered: ref Registries->Registered;
init(drawctxt: ref Draw->Context, argv: list of string)
{
sys = load Sys Sys->PATH;
keyring = load Keyring Keyring->PATH;
auth = load Auth Auth->PATH;
if (auth == nil)
badmodule(Auth->PATH);
sh = load Sh Sh->PATH;
if (sh == nil)
badmodule(Sh->PATH);
dial = load Dial Dial->PATH;
if (dial == nil)
badmodule(Dial->PATH);
arg := load Arg Arg->PATH;
if (arg == nil)
badmodule(Arg->PATH);
auth->init();
algs: list of string;
arg->init(argv);
keyfile: string;
initscript: string;
doauth := 1;
synchronous := 0;
trusted := 0;
regattrs: list of (string, string);
arg->setusage("listen [-i {initscript}] [-Ast] [-f keyfile] [-a alg]... addr command [arg...]");
while ((opt := arg->opt()) != 0) {
case opt {
'a' =>
algs = arg->earg() :: algs;
'A' =>
doauth = 0;
'f' =>
keyfile = arg->earg();
if (! (keyfile[0] == '/' || (len keyfile > 2 && keyfile[0:2] == "./")))
keyfile = "/usr/" + user() + "/keyring/" + keyfile;
'i' =>
initscript = arg->earg();
'v' =>
verbose = 1;
's' =>
synchronous = 1;
't' =>
trusted = 1;
'r' =>
a := arg->earg();
v := arg->earg();
regattrs = (a, v) :: regattrs;
* =>
arg->usage();
}
}
if(regattrs != nil){
registries = load Registries Registries->PATH;
if(registries == nil)
badmodule(Registries->PATH);
registries->init();
}
if (doauth && algs == nil)
algs = getalgs();
if (algs != nil) {
if (keyfile == nil)
keyfile = "/usr/" + user() + "/keyring/default";
serverkey = keyring->readauthinfo(keyfile);
if (serverkey == nil) {
sys->fprint(stderr(), "listen: cannot read %s: %r\n", keyfile);
raise "fail:bad keyfile";
}
}
if(!trusted){
sys->unmount(nil, "/mnt/keys"); # should do for now
# become none?
}
argv = arg->argv();
n := len argv;
if (n < 2)
arg->usage();
arg = nil;
sync := chan[1] of string;
spawn listen(drawctxt, hd argv, tl argv, algs, regattrs, initscript, sync);
e := <-sync;
if(e != nil)
raise "fail:" + e;
if(synchronous){
e = <-sync;
if(e != nil)
raise "fail:" + e;
}
}
listen(drawctxt: ref Draw->Context, addr: string, argv: list of string,
algs: list of string, regattrs: list of (string, string),
initscript: string, sync: chan of string)
{
{
listen1(drawctxt, addr, argv, algs, regattrs, initscript, sync);
} exception e {
"fail:*" =>
sync <-= e;
}
}
listen1(drawctxt: ref Draw->Context, addr: string, argv: list of string,
algs: list of string, regattrs: list of (string, string),
initscript: string, sync: chan of string)
{
sys->pctl(Sys->FORKFD, nil);
if(regattrs != nil){
sys->pctl(Sys->FORKNS, nil);
registry := Registry.new("/mnt/registry");
if(registry == nil)
registry = Registry.connect(nil, nil, nil);
if(registry == nil){
sys->fprint(stderr(), "reglisten: cannot register: %r\n");
sync <-= "cannot register";
exit;
}
err: string;
myaddr := addr;
(n, lst) := sys->tokenize(myaddr, "!");
if (n == 3 && hd tl lst == "*") {
sysname := readfile("/dev/sysname");
if (sysname != nil && sysname[len sysname - 1] == '\n')
sysname = sysname[:len sysname - 1];
myaddr = hd lst + "!" + sysname + "!" + hd tl tl lst;
}
(registered, err) = registry.register(myaddr, Attributes.new(regattrs), 0);
if(registered == nil){
sys->fprint(stderr(), "reglisten: cannot register %s: %s\n", myaddr, err);
sync <-= "cannot register";
exit;
}
}
ctxt := Context.new(drawctxt);
acon := dial->announce(addr);
if (acon == nil) {
sys->fprint(stderr(), "listen: failed to announce on '%s': %r\n", addr);
sync <-= "cannot announce";
exit;
}
ctxt.set("user", nil);
if (initscript != nil) {
ctxt.setlocal("net", ref Sh->Listnode(nil, acon.dir) :: nil);
ctxt.run(ref Sh->Listnode(nil, initscript) :: nil, 0);
initscript = nil;
}
# make sure the shell command is parsed only once.
cmd := sh->stringlist2list(argv);
if((hd argv) != nil && (hd argv)[0] == '{'){
(c, e) := sh->parse(hd argv);
if(c == nil){
sys->fprint(stderr(), "listen: %s\n", e);
sync <-= "parse error";
exit;
}
cmd = ref Sh->Listnode(c, hd argv) :: tl cmd;
}
sync <-= nil;
listench := chan of (int, ref Sys->Connection);
authch := chan of (string, ref Sys->Connection);
spawn listener(listench, acon, addr);
for (;;) {
user := "";
ccon: ref Sys->Connection;
alt {
(lok, c) := <-listench =>
if (lok == -1)
sync <-= "listen";
if (algs != nil) {
spawn authenticator(authch, c, algs, addr);
continue;
}
ccon = c;
(user, ccon) = <-authch =>
;
}
if (user != nil)
ctxt.set("user", sh->stringlist2list(user :: nil));
ctxt.set("net", ref Sh->Listnode(nil, ccon.dir) :: nil);
# XXX could do this in a separate process too, to
# allow new connections to arrive and start authenticating
# while the shell command is still running.
sys->dup(ccon.dfd.fd, 0);
sys->dup(ccon.dfd.fd, 1);
ccon.dfd = ccon.cfd = nil;
ctxt.run(cmd, 0);
sys->dup(2, 0);
sys->dup(2, 1);
}
}
listener(listench: chan of (int, ref Sys->Connection), c: ref Sys->Connection, addr: string)
{
for (;;) {
nc := dial->listen(c);
if (nc == nil) {
sys->fprint(stderr(), "listen: listen error on '%s': %r\n", addr);
listench <-= (-1, nc);
exit;
}
if (verbose)
sys->fprint(stderr(), "listen: got connection on %s from %s",
addr, readfile(nc.dir + "/remote"));
nc.dfd = dial->accept(nc);
if (nc.dfd == nil)
sys->fprint(stderr(), "listen: cannot accept: %r\n");
else
listench <-= (0, nc);
}
}
authenticator(authch: chan of (string, ref Sys->Connection),
c: ref Sys->Connection, algs: list of string, addr: string)
{
err: string;
(c.dfd, err) = auth->server(algs, serverkey, c.dfd, 0);
if (c.dfd == nil) {
sys->fprint(stderr(), "listen: auth on %s failed: %s\n", addr, err);
return;
}
if (verbose)
sys->fprint(stderr(), "listen: authenticated on %s as %s\n", addr, err);
authch <-= (err, c);
}
stderr(): ref Sys->FD
{
return sys->fildes(2);
}
user(): string
{
u := readfile("/dev/user");
if (u == nil)
return "nobody";
return u;
}
readfile(f: string): string
{
fd := sys->open(f, sys->OREAD);
if(fd == nil)
return nil;
buf := array[1024] of byte;
n := sys->read(fd, buf, len buf);
if(n < 0)
return nil;
return string buf[0:n];
}
getalgs(): list of string
{
sslctl := readfile("#D/clone");
if (sslctl == nil) {
sslctl = readfile("#D/ssl/clone");
if (sslctl == nil)
return nil;
sslctl = "#D/ssl/" + sslctl;
} else
sslctl = "#D/" + sslctl;
(nil, algs) := sys->tokenize(readfile(sslctl + "/encalgs") + " " + readfile(sslctl + "/hashalgs"), " \t\n");
return "none" :: algs;
}
|
