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/*
* PgBouncer - Lightweight connection pooler for PostgreSQL.
*
* Copyright (c) 2007-2009 Marko Kreen, Skype Technologies OÜ
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Compat functions for OSes where libc does not provide them.
*/
#include "bouncer.h"
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_UCRED_H
#include <ucred.h>
#endif
#ifdef HAVE_SYS_UCRED_H
#include <sys/ucred.h>
#endif
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
void change_user(const char *user)
{
const struct passwd *pw;
gid_t gset[1];
/* check for a valid username */
pw = getpwnam(user);
if (pw == NULL)
fatal("could not find user '%s' to switch to", user);
gset[0] = pw->pw_gid;
if (getuid() == 0) {
if (setgroups(1, gset) < 0)
fatal_perror("failed to reset groups");
}
if (setgid(pw->pw_gid) < 0 || setuid(pw->pw_uid) < 0)
fatal_perror("failed to assume identity of user '%s'", user);
if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
fatal("setuid() failed to work");
}
/* set permissions & mode for file */
void change_file_mode(const char *fn, mode_t mode,
const char *user_name,
const char *group_name)
{
int res;
uid_t uid = -1;
gid_t gid = -1;
unsigned long val;
char *end;
/* user lookup */
if (user_name && user_name[0]) {
const struct passwd *pw;
val = strtoul(user_name, &end, 0);
if (*end == 0) {
uid = val;
} else {
/* check for a valid username */
pw = getpwnam(user_name);
if (!pw)
fatal("could not find user '%s': %s",
user_name, strerror(errno));
uid = pw->pw_uid;
}
}
/* group lookup */
if (group_name && group_name[0]) {
struct group *gr;
val = strtoul(group_name, &end, 0);
if (*end == 0) {
gid = val;
} else {
gr = getgrnam(group_name);
if (!gr)
fatal("could not find group '%s': %s",
group_name, strerror(errno));
gid = gr->gr_gid;
}
}
/* change user/group */
if (uid != (uid_t)-1 || gid != (gid_t)-1) {
res = chown(fn, uid, gid);
if (res != 0) {
fatal("chown(%s, %d, %d) failed: %s",
fn, uid, gid, strerror(errno));
}
}
/* change mode */
res = chmod(fn, mode);
if (res != 0) {
fatal("Failure to chmod(%s, 0%o): %s",
fn, mode, strerror(errno));
}
}
/*
* UNIX socket helper.
*/
bool check_unix_peer_name(int fd, const char *username)
{
int res;
uid_t peer_uid = -1;
gid_t peer_gid = -1;
struct passwd *pw;
res = getpeereid(fd, &peer_uid, &peer_gid);
if (res < 0)
return false;
pw = getpwuid(peer_uid);
if (!pw)
return false;
return strcmp(pw->pw_name, username) == 0;
}
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