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fs_wrapper: added stat and lstat

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Signed-off-by: Abdelrahman Youssef <abdelrahmanyossef12@gmail.com>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
This commit is contained in:
Abdelrahman yossef
2024-04-02 16:40:06 +02:00
committed by Jakub Jelen
parent 19e62a78a6
commit fc451a8f3d
3 changed files with 180 additions and 28 deletions
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173
tests/fs_wrapper.c Normal file
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#define _GNU_SOURCE
#include <dlfcn.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
void destructor(void) __attribute__((destructor));
struct file {
char *name;
uid_t uid;
gid_t gid;
} file = {0};
void
destructor(void)
{
free(file.name);
}
typedef int (*__libc_chown)(const char *pathname, uid_t owner, gid_t group);
typedef int (*__libc_fchownat)(int dirfd,
const char *pathname,
uid_t owner,
gid_t group,
int flags);
typedef int (*__libc_stat)(const char *pathname, struct stat *statbuf);
typedef int (*__libc_xstat)(int ver,
const char *pathname,
struct stat *statbuf);
typedef int (*__libc_lxstat)(int ver,
const char *pathname,
struct stat *statbuf);
typedef int (*__libc_lstat)(const char *pathname, struct stat *statbuf);
static int
chown_helper(const char *pathname, uid_t owner, gid_t group)
{
if (strlen(pathname) > 7 && strncmp(pathname, "/dev/pt", 7) == 0) {
/*
* The OpenSSH server modified the PTY which requires root permissions
* see torture_request_pty_modes
* */
return 0;
}
if (strlen(pathname) > 4 && strncmp(pathname, "/tmp", 4) == 0) {
/*
* faking chown because It requires root permissions to modify the owner
* under /tmp
* It's also a helper for torture_sftp_setstat
* */
if (file.name != NULL) {
free((char *)file.name);
}
file.name = strdup(pathname);
file.uid = owner;
file.gid = group;
return 0;
}
return -1;
}
static void
stat_helper(const char *pathname, struct stat *statbuf)
{
if (file.name != NULL && strcmp(pathname, file.name) == 0) {
statbuf->st_uid = file.uid;
statbuf->st_gid = file.gid;
}
}
/* silent gcc */
int chown(const char *pathname, uid_t owner, gid_t group);
int
chown(const char *pathname, uid_t owner, gid_t group)
{
__libc_chown original_chown = NULL;
int rc;
rc = chown_helper(pathname, owner, group);
if (rc == 0) {
return 0;
}
original_chown = (__libc_chown)dlsym(RTLD_NEXT, "chown");
return (*original_chown)(pathname, owner, group);
}
/* SFTP Server calls fchownat for symlinks */
int
fchownat(int dirfd, const char *pathname, uid_t owner, gid_t group, int flags);
int
fchownat(int dirfd, const char *pathname, uid_t owner, gid_t group, int flags)
{
__libc_fchownat original_fchownat = NULL;
int rc;
rc = chown_helper(pathname, owner, group);
if (rc == 0) {
return 0;
}
original_fchownat = (__libc_fchownat)dlsym(RTLD_NEXT, "fchownat");
return (*original_fchownat)(dirfd, pathname, owner, group, flags);
}
int stat(const char *pathname, struct stat *statbuf);
int
stat(const char *pathname, struct stat *statbuf)
{
int rc;
__libc_stat original_stat = NULL;
original_stat = (__libc_stat)dlsym(RTLD_NEXT, "stat");
rc = (*original_stat)(pathname, statbuf);
stat_helper(pathname, statbuf);
return rc;
}
/* CentOS8 calls xstat */
int __xstat(int ver, const char *pathname, struct stat *statbuf);
int
__xstat(int ver, const char *pathname, struct stat *statbuf)
{
int rc;
__libc_xstat original_xstat = NULL;
original_xstat = (__libc_xstat)dlsym(RTLD_NEXT, "__xstat");
rc = (*original_xstat)(ver, pathname, statbuf);
stat_helper(pathname, statbuf);
return rc;
}
int __lxstat(int ver, const char *pathname, struct stat *statbuf);
int
__lxstat(int ver, const char *pathname, struct stat *statbuf)
{
int rc;
__libc_lxstat original_lxstat = NULL;
original_lxstat = (__libc_lxstat)dlsym(RTLD_NEXT, "__lxstat");
rc = (*original_lxstat)(ver, pathname, statbuf);
stat_helper(pathname, statbuf);
return rc;
}
int lstat(const char *pathname, struct stat *statbuf);
int
lstat(const char *pathname, struct stat *statbuf)
{
int rc;
__libc_lstat original_lstat = NULL;
original_lstat = (__libc_lstat)dlsym(RTLD_NEXT, "lstat");
rc = (*original_lstat)(pathname, statbuf);
stat_helper(pathname, statbuf);
return rc;
}