Skip to content
Projects
Groups
Snippets
Help
Loading...
Help
Support
Keyboard shortcuts
?
Submit feedback
Contribute to GitLab
Sign in / Register
Toggle navigation
slapos
Project overview
Project overview
Details
Activity
Releases
Repository
Repository
Files
Commits
Branches
Tags
Contributors
Graph
Compare
Issues
0
Issues
0
List
Boards
Labels
Milestones
Merge Requests
0
Merge Requests
0
CI / CD
CI / CD
Pipelines
Jobs
Schedules
Analytics
Analytics
CI / CD
Repository
Value Stream
Wiki
Wiki
Snippets
Snippets
Members
Members
Collapse sidebar
Close sidebar
Activity
Graph
Create a new issue
Jobs
Commits
Issue Boards
Open sidebar
Lu Xu
slapos
Commits
99db52ed
Commit
99db52ed
authored
Oct 23, 2023
by
Kirill Smelkov
Browse files
Options
Browse Files
Download
Email Patches
Plain Diff
.
parent
fe9abf1a
Changes
1
Show whitespace changes
Inline
Side-by-side
Showing
1 changed file
with
87 additions
and
0 deletions
+87
-0
software/ors-amarisoft/ru/capdo.c
software/ors-amarisoft/ru/capdo.c
+87
-0
No files found.
software/ors-amarisoft/ru/
xexec
.c
→
software/ors-amarisoft/ru/
capdo
.c
View file @
99db52ed
...
...
@@ -16,27 +16,72 @@
// See COPYING file for full licensing terms.
// See https://www.nexedi.com/licensing for rationale and options.
//
Program xexec does what exec in shell does but as standalone program
.
// It is used as trampoline to run
a
script under setcap environment.
//
`capdo prog ...` executes prog with inherited capabilities
.
// It is used as trampoline to run script under setcap environment.
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/capability.h>
#include <sys/prctl.h>
static
int
die
(
const
char
*
fmt
,
...);
static
int
die_err
(
const
char
*
msg
);
int
main
(
int
argc
,
const
char
*
argv
[])
{
if
(
argc
<
2
)
{
fprintf
(
stderr
,
"E: usage: xexec prog arguments...
\n
"
);
exit
(
128
);
cap_t
caps
;
cap_value_t
cap
;
cap_flag_value_t
flag
;
uint64_t
capbits
=
0
;
if
(
argc
<
2
)
die
(
"usage: capdo prog arguments..."
);
// permitted -> inheritable (so that we can raise ambient)
caps
=
cap_get_proc
();
if
(
!
caps
)
die
(
"cap_get_proc failed"
);
for
(
cap
=
0
;
cap
<
CAP_LAST_CAP
;
cap
++
)
{
cap_get_flag
(
caps
,
cap
,
CAP_PERMITTED
,
&
flag
)
&&
die_err
(
"cap_get_flag"
);
if
(
flag
)
{
cap_set_flag
(
caps
,
CAP_INHERITABLE
,
1
,
&
cap
,
flag
)
&&
die_err
(
"cap_set_flag"
);
capbits
|=
(
1ULL
<<
cap
);
}
}
cap_set_proc
(
caps
)
&&
die_err
(
"cap_set_proc"
);
argv
++
;
// raise ambient capabities to what is permitted/inheritable
for
(
cap
=
0
;
cap
<=
CAP_LAST_CAP
;
cap
++
)
{
if
(
capbits
&
(
1ULL
<<
cap
))
prctl
(
PR_CAP_AMBIENT
,
PR_CAP_AMBIENT_RAISE
,
cap
,
0
,
0
)
&&
die_err
(
"prctl ambient raise"
);
}
// tail to exec target
argv
++
;
execv
(
argv
[
0
],
argv
);
// the only chance we are here is due to error
fprintf
(
stderr
,
"xexec: %s: %s
\n
"
,
argv
[
0
],
strerror
(
errno
));
// the only chance we are here is due to exec error
die_err
(
argv
[
0
]);
}
static
int
die
(
const
char
*
fmt
,
...)
{
va_list
ap
;
fprintf
(
stderr
,
"E: capdo: "
);
va_start
(
ap
,
fmt
);
vfprintf
(
stderr
,
fmt
,
ap
);
va_end
(
ap
);
fprintf
(
stderr
,
"
\n
"
);
exit
(
128
);
return
0
;
}
static
int
die_err
(
const
char
*
msg
)
{
return
die
(
"%s: %s"
,
msg
,
strerror
(
errno
));
}
Write
Preview
Markdown
is supported
0%
Try again
or
attach a new file
Attach a file
Cancel
You are about to add
0
people
to the discussion. Proceed with caution.
Finish editing this message first!
Cancel
Please
register
or
sign in
to comment