static int copy_symlink(pool *p, const char *src_dir, const char *src_path,
const char *dst_dir, const char *dst_path, uid_t uid, gid_t gid) {
char *link_path = pcalloc(p, PR_TUNABLE_BUFFER_SIZE);
int len;
len = pr_fsio_readlink(src_path, link_path, PR_TUNABLE_BUFFER_SIZE-1);
if (len < 0) {
pr_log_pri(PR_LOG_WARNING, "CreateHome: error reading link '%s': %s",
src_path, strerror(errno));
return -1;
}
link_path[len] = '\0';
/* If the target of the link lies within the src path, rename that portion
* of the link to be the corresponding part of the dst path.
*/
if (strncmp(link_path, src_dir, strlen(src_dir)) == 0) {
link_path = pdircat(p, dst_dir, link_path + strlen(src_dir), NULL);
}
if (pr_fsio_symlink(link_path, dst_path) < 0) {
pr_log_pri(PR_LOG_WARNING, "CreateHome: error symlinking '%s' to '%s': %s",
link_path, dst_path, strerror(errno));
return -1;
}
/* Make sure the new symlink has the proper ownership. */
if (pr_fsio_chown(dst_path, uid, gid) < 0) {
pr_log_pri(PR_LOG_WARNING, "CreateHome: error chown'ing '%s' to %u/%u: %s",
dst_path, (unsigned int) uid, (unsigned int) gid, strerror(errno));
}
return 0;
}
static int create_dir(const char *dir, uid_t uid, gid_t gid,
mode_t mode) {
mode_t prev_mask;
struct stat st;
int res = -1;
pr_fs_clear_cache2(dir);
res = pr_fsio_stat(dir, &st);
if (res == -1 &&
errno != ENOENT) {
int xerrno = errno;
pr_log_pri(PR_LOG_WARNING, "error checking '%s': %s", dir,
strerror(xerrno));
errno = xerrno;
return -1;
}
/* The directory already exists. */
if (res == 0) {
pr_trace_msg(trace_channel, 8, "'%s' already exists", dir);
pr_log_debug(DEBUG3, "CreateHome: '%s' already exists", dir);
return 0;
}
/* The given mode is absolute, not subject to any Umask setting. */
prev_mask = umask(0);
if (pr_fsio_mkdir(dir, mode) < 0) {
int xerrno = errno;
umask(prev_mask);
pr_log_pri(PR_LOG_WARNING, "error creating '%s': %s", dir,
strerror(xerrno));
errno = xerrno;
return -1;
}
umask(prev_mask);
if (pr_fsio_chown(dir, uid, gid) < 0) {
int xerrno = errno;
pr_log_pri(PR_LOG_WARNING, "error setting ownership of '%s': %s", dir,
strerror(xerrno));
errno = xerrno;
return -1;
}
pr_trace_msg(trace_channel, 8, "directory '%s' created", dir);
pr_log_debug(DEBUG6, "CreateHome: directory '%s' created", dir);
return 0;
}
/* srcdir is to be considered a "skeleton" directory, in the manner of
* /etc/skel, and destdir is a user's newly created home directory that needs
* to be populated with the files in srcdir.
*/
static int copy_dir(pool *p, const char *src_dir, const char *dst_dir,
uid_t uid, gid_t gid) {
DIR *dh = NULL;
struct dirent *dent = NULL;
dh = opendir(src_dir);
if (dh == NULL) {
pr_log_pri(PR_LOG_WARNING, "CreateHome: error copying '%s' skel files: %s",
src_dir, strerror(errno));
return -1;
}
while ((dent = readdir(dh)) != NULL) {
struct stat st;
char *src_path, *dst_path;
pr_signals_handle();
/* Skip "." and ".." */
if (strncmp(dent->d_name, ".", 2) == 0 ||
strncmp(dent->d_name, "..", 3) == 0) {
continue;
}
src_path = pdircat(p, src_dir, dent->d_name, NULL);
dst_path = pdircat(p, dst_dir, dent->d_name, NULL);
if (pr_fsio_lstat(src_path, &st) < 0) {
pr_log_debug(DEBUG3, "CreateHome: unable to stat '%s' (%s), skipping",
src_path, strerror(errno));
continue;
}
/* Is this path to a directory? */
if (S_ISDIR(st.st_mode)) {
create_dir(dst_path, uid, gid, st.st_mode);
copy_dir(p, src_path, dst_path, uid, gid);
continue;
/* Is this path to a regular file? */
} else if (S_ISREG(st.st_mode)) {
mode_t dst_mode = st.st_mode;
/* Make sure to prevent S{U,G}ID permissions on target files. */
if (dst_mode & S_ISUID)
dst_mode &= ~S_ISUID;
if (dst_mode & S_ISGID)
dst_mode &= ~S_ISGID;
(void) pr_fs_copy_file(src_path, dst_path);
/* Make sure the destination file has the proper ownership and mode. */
if (pr_fsio_chown(dst_path, uid, gid) < 0) {
pr_log_pri(PR_LOG_WARNING, "CreateHome: error chown'ing '%s' "
"to %u/%u: %s", dst_path, (unsigned int) uid, (unsigned int) gid,
strerror(errno));
}
if (pr_fsio_chmod(dst_path, dst_mode) < 0) {
pr_log_pri(PR_LOG_WARNING, "CreateHome: error chmod'ing '%s' to "
"%04o: %s", dst_path, (unsigned int) dst_mode, strerror(errno));
}
continue;
/* Is this path a symlink? */
} else if (S_ISLNK(st.st_mode)) {
copy_symlink(p, src_dir, src_path, dst_dir, dst_path, uid, gid);
continue;
/* All other file types are skipped */
} else {
pr_log_debug(DEBUG3, "CreateHome: skipping skel file '%s'", src_path);
continue;
}
}
closedir(dh);
return 0;
}