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
|
/*
Copyright (C) 1995,96,99,2000,02 Free Software Foundation, Inc.
Written by Michael I. Bushnell.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <assert-backtrace.h>
#include <hurd/fsys.h>
#include <hurd/paths.h>
#include <hurd/ports.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "fshelp.h"
error_t
fshelp_fetch_root (struct transbox *box, void *cookie,
file_t dotdot,
struct iouser *user,
int flags,
fshelp_fetch_root_callback1_t callback1,
fshelp_fetch_root_callback2_t callback2,
retry_type *retry, char *retryname,
file_t *root)
{
error_t err;
mach_port_t control;
int cancel;
int i;
start_over:
if (box->active != MACH_PORT_NULL)
assert_backtrace ((box->flags & TRANSBOX_STARTING) == 0);
else
{
uid_t uid, gid;
char *argz;
size_t argz_len;
error_t err;
mach_port_t ports[INIT_PORT_MAX];
int ints[INIT_INT_MAX];
mach_port_t fds[STDERR_FILENO + 1];
auth_t ourauth, newauth;
mach_port_t reauth (mach_port_t port) /* Consumes PORT. */
{
mach_port_t rend, ret;
error_t err;
if (port == MACH_PORT_NULL)
return port;
if (ourauth == MACH_PORT_NULL)
/* We have no auth server, so we aren't doing reauthentications.
Just pass on our own ports directly. */
return port;
rend = mach_reply_port ();
/* MAKE_SEND is safe here because we destroy REND ourselves. */
err = io_reauthenticate (port, rend,
MACH_MSG_TYPE_MAKE_SEND);
if (! err)
err = auth_user_authenticate (newauth, rend,
MACH_MSG_TYPE_MAKE_SEND, &ret);
mach_port_deallocate (mach_task_self (), port);
if (err)
ret = MACH_PORT_NULL;
mach_port_mod_refs (mach_task_self (), rend, MACH_PORT_RIGHT_RECEIVE, -1);
return ret;
}
error_t fetch_underlying (int flags, mach_port_t *underlying,
mach_msg_type_name_t *underlying_type,
task_t task, void *cookie)
{
return
(*callback2) (box->cookie, cookie, flags,
underlying, underlying_type);
}
if (box->flags & TRANSBOX_STARTING)
{
box->flags |= TRANSBOX_WANTED;
cancel = pthread_hurd_cond_wait_np (&box->wakeup, box->lock);
if (cancel)
return EINTR;
goto start_over;
}
box->flags |= TRANSBOX_STARTING;
pthread_mutex_unlock (box->lock);
err = (*callback1) (box->cookie, cookie, &uid, &gid, &argz, &argz_len);
if (err)
goto return_error;
ourauth = getauth ();
if (ourauth == MACH_PORT_NULL)
newauth = ourauth;
else
{
uid_t uidarray[2] = { uid, uid };
gid_t gidarray[2] = { gid, gid };
err = auth_makeauth (ourauth, 0, MACH_MSG_TYPE_COPY_SEND, 0,
uidarray, 1, uidarray, 2,
gidarray, 1, gidarray, 2, &newauth);
if (err)
goto return_error;
}
memset (ports, 0, INIT_PORT_MAX * sizeof (mach_port_t));
memset (fds, 0, (STDERR_FILENO + 1) * sizeof (mach_port_t));
memset (ints, 0, INIT_INT_MAX * sizeof (int));
ports[INIT_PORT_CWDIR] = dotdot;
ports[INIT_PORT_CRDIR] = reauth (getcrdir ());
ports[INIT_PORT_AUTH] = newauth;
fds[STDERR_FILENO] = reauth (getdport (STDERR_FILENO));
err = fshelp_start_translator_long (fetch_underlying, cookie,
argz, argz, argz_len,
fds, MACH_MSG_TYPE_COPY_SEND,
STDERR_FILENO + 1,
ports, MACH_MSG_TYPE_COPY_SEND,
INIT_PORT_MAX,
ints, INIT_INT_MAX,
uid,
0, &control);
for (i = 0; i <= STDERR_FILENO; i++)
mach_port_deallocate (mach_task_self (), fds[i]);
for (i = 0; i < INIT_PORT_MAX; i++)
if (i != INIT_PORT_CWDIR)
mach_port_deallocate (mach_task_self (), ports[i]);
pthread_mutex_lock (box->lock);
free (argz);
return_error:
box->flags &= ~TRANSBOX_STARTING;
if (box->flags & TRANSBOX_WANTED)
{
box->flags &= ~TRANSBOX_WANTED;
pthread_cond_broadcast (&box->wakeup);
}
if (err)
return err;
if (! MACH_PORT_VALID (control))
/* The start translator succeeded, but it returned a bogus port. */
return EDIED;
box->active = control;
}
control = box->active;
mach_port_mod_refs (mach_task_self (), control,
MACH_PORT_RIGHT_SEND, 1);
pthread_mutex_unlock (box->lock);
/* Cancellation point XXX */
err = fsys_getroot (control, dotdot, MACH_MSG_TYPE_COPY_SEND,
user->uids->ids, user->uids->num,
user->gids->ids, user->gids->num,
flags, retry, retryname, root);
pthread_mutex_lock (box->lock);
if ((err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED)
&& control == box->active)
fshelp_set_active (box, MACH_PORT_NULL, 0);
else
mach_port_deallocate (mach_task_self (), control);
if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED)
goto start_over;
return err;
}
/* A callback function for short-circuited translators. S_ISLNK and
S_IFSOCK must be handled elsewhere. */
error_t
fshelp_short_circuited_callback1 (void *cookie1, void *cookie2,
uid_t *uid, gid_t *gid,
char **argz, size_t *argz_len)
{
struct fshelp_stat_cookie2 *statc = cookie2;
switch (*statc->modep & S_IFMT)
{
case S_IFCHR:
case S_IFBLK:
if (asprintf (argz, "%s%c%d%c%d",
(S_ISCHR (*statc->modep)
? _HURD_CHRDEV : _HURD_BLKDEV),
0, major (statc->statp->st_rdev),
0, minor (statc->statp->st_rdev)) < 0)
return ENOMEM;
*argz_len = strlen (*argz) + 1;
*argz_len += strlen (*argz + *argz_len) + 1;
*argz_len += strlen (*argz + *argz_len) + 1;
break;
case S_IFIFO:
if (asprintf (argz, "%s", _HURD_FIFO) < 0)
return ENOMEM;
*argz_len = strlen (*argz) + 1;
break;
default:
return ENOENT;
}
*uid = statc->statp->st_uid;
*gid = statc->statp->st_gid;
return 0;
}
|
