crtxcr/exile.h
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updated README

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Albert S. 2019-11-15 21:53:26 +01:00
parent 6f1b27ee51
commit 1b8504c052
2 changed files with 62 additions and 14 deletions
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39
README.md
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@ -1,10 +1,13 @@
qssb (quite simple sandbox) qssb.h (quite simple sandbox)
=========================== =============================
qssb.h is a simple header only library for easy sandboxing of qssb.h is a simple header only library that provides an interface
applications. to sandbox applications. Using Seccomp and Linux Namespaces for that
purpose requires some knowledge of annoying details which this library
aims to abstract away as much as possible.
It aims to provide an interface to avoid the annoying details that Status
using Seccomp and Linux Namespaces requires. ======
No release yet, API is unstable.
Features Features
======== ========
@ -13,11 +16,25 @@ privileges, isolating the application from the network, etc.
Requirements Requirements
============ ============
Kernel x.y.z. Kernel >=3.17
sys/capabilities.h header. Depending on your system, libcap
might be needed for this.
Status
======
No release yet, API is unstable. FAQ
===
Does the process need to be priviliged to utilize the library?
----------------------------------------------------------------
No.
It doesn't work on Debian!
--------------------------
You can thank a Debian-specific patch for that. In the future,
the library may check against that. Execute
echo 1 > /proc/sys/kernel/unprivileged_userns_clone to disable that
patch for now.
Documentation Documentation
============= =============
@ -30,7 +47,7 @@ Real world project: cgit sandboxed: https://git.quitesimple.org/cgitsb
Contributing Contributing
============ ============
Contributations are very welcome. Options: Contributions are very welcome. Options:
1) Pull-Request: github.com/quitesimpleorg/qssb 1) Pull-Request: github.com/quitesimpleorg/qssb
2) Mail to qssb at quitesimple.org with instructions 2) Mail to qssb at quitesimple.org with instructions
on where to pull the changes. on where to pull the changes.

37
qssb.h
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@ -140,7 +140,18 @@ int random_string(char *buffer, size_t buffer_length)
static int mkdir_structure(const char *p, mode_t mode) static int mkdir_structure(const char *p, mode_t mode)
{ {
char path[PATH_MAX] = { 0 }; char path[PATH_MAX] = { 0 };
snprintf(path, sizeof(path), "%s/", p); int res = snprintf(path, sizeof(path), "%s/", p);
if(res < 0)
{
QSSB_LOG_ERROR("qssb: mkdir_strucutre: error during path concatination\n");
return -EINVAL;
}
if(res >= PATH_MAX)
{
QSSB_LOG_ERROR("qssb: mkdir_structure: path concatination truncated\n");
return -EINVAL;
}
char *begin = path; char *begin = path;
char *end = begin+1; char *end = begin+1;
@ -193,7 +204,17 @@ static int mount_to_chroot(const char *chroot_target_path, char **paths, unsigne
while(path != NULL) while(path != NULL)
{ {
char path_inside_chroot[PATH_MAX]; char path_inside_chroot[PATH_MAX];
snprintf(path_inside_chroot, sizeof(path_inside_chroot), "%s/%s", chroot_target_path, path); int written = snprintf(path_inside_chroot, sizeof(path_inside_chroot), "%s/%s", chroot_target_path, path);
if(written < 0)
{
QSSB_LOG_ERROR("qssb: mount_to_chroot: Error during path concatination\n");
return -EINVAL;
}
if(written >= PATH_MAX)
{
QSSB_LOG_ERROR("qssb: mount_to_chroot: path concatination truncated\n");
return -EINVAL;
}
int ret = mkdir_structure(path_inside_chroot, 0700); int ret = mkdir_structure(path_inside_chroot, 0700);
if(ret < 0) if(ret < 0)
{ {
@ -404,7 +425,17 @@ int qssb_enable_policy(struct qssb_policy *policy)
char random_str[17]; char random_str[17];
if(random_string(random_str, sizeof(random_str)) == 16) if(random_string(random_str, sizeof(random_str)) == 16)
{ {
snprintf(target_dir, sizeof(target_dir), "%s/.sandbox_%" PRIdMAX "_%s", QSSB_TEMP_DIR, (intmax_t)getpid(), random_str); int res = snprintf(target_dir, sizeof(target_dir), "%s/.sandbox_%" PRIdMAX "_%s", QSSB_TEMP_DIR, (intmax_t)getpid(), random_str);
if(res < 0)
{
QSSB_LOG_ERROR("qssb: qssb_enable_policy: error during path concatination\n");
return -EINVAL;
}
if(res >= PATH_MAX)
{
QSSB_LOG_ERROR("qssb: qssb_enable_policy: path concatination truncated\n");
return -EINVAL;
}
policy->chroot_target_path = target_dir; policy->chroot_target_path = target_dir;
} }
else else