зеркало из https://github.com/Azure/sonic-openssh.git
235 строки
6.7 KiB
C
235 строки
6.7 KiB
C
/*
|
|
* Copyright (c) 2000 Markus Friedl. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
RCSID("$OpenBSD: auth.c,v 1.14 2001/01/21 19:05:43 markus Exp $");
|
|
|
|
#ifdef HAVE_LOGIN_H
|
|
#include <login.h>
|
|
#endif
|
|
#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
|
|
#include <shadow.h>
|
|
#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
|
|
|
|
#include "xmalloc.h"
|
|
#include "match.h"
|
|
#include "groupaccess.h"
|
|
#include "log.h"
|
|
#include "servconf.h"
|
|
#include "auth.h"
|
|
#include "auth-options.h"
|
|
#include "canohost.h"
|
|
|
|
/* import */
|
|
extern ServerOptions options;
|
|
|
|
/*
|
|
* Check if the user is allowed to log in via ssh. If user is listed
|
|
* in DenyUsers or one of user's groups is listed in DenyGroups, false
|
|
* will be returned. If AllowUsers isn't empty and user isn't listed
|
|
* there, or if AllowGroups isn't empty and one of user's groups isn't
|
|
* listed there, false will be returned.
|
|
* If the user's shell is not executable, false will be returned.
|
|
* Otherwise true is returned.
|
|
*/
|
|
int
|
|
allowed_user(struct passwd * pw)
|
|
{
|
|
struct stat st;
|
|
char *shell;
|
|
int i;
|
|
#ifdef WITH_AIXAUTHENTICATE
|
|
char *loginmsg;
|
|
#endif /* WITH_AIXAUTHENTICATE */
|
|
#if !defined(USE_PAM) && defined(HAVE_SHADOW_H) && \
|
|
!defined(DISABLE_SHADOW) && defined(HAS_SHADOW_EXPIRE)
|
|
struct spwd *spw;
|
|
|
|
/* Shouldn't be called if pw is NULL, but better safe than sorry... */
|
|
if (!pw || !pw->pw_name)
|
|
return 0;
|
|
|
|
spw = getspnam(pw->pw_name);
|
|
if (spw != NULL) {
|
|
int days = time(NULL) / 86400;
|
|
|
|
/* Check account expiry */
|
|
if ((spw->sp_expire >= 0) && (days > spw->sp_expire))
|
|
return 0;
|
|
|
|
/* Check password expiry */
|
|
if ((spw->sp_lstchg >= 0) && (spw->sp_max >= 0) &&
|
|
(days > (spw->sp_lstchg + spw->sp_max)))
|
|
return 0;
|
|
}
|
|
#else
|
|
/* Shouldn't be called if pw is NULL, but better safe than sorry... */
|
|
if (!pw || !pw->pw_name)
|
|
return 0;
|
|
#endif
|
|
|
|
/*
|
|
* Get the shell from the password data. An empty shell field is
|
|
* legal, and means /bin/sh.
|
|
*/
|
|
shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
|
|
|
|
/* deny if shell does not exists or is not executable */
|
|
if (stat(shell, &st) != 0)
|
|
return 0;
|
|
if (!((st.st_mode & S_IFREG) && (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP))))
|
|
return 0;
|
|
|
|
/* Return false if user is listed in DenyUsers */
|
|
if (options.num_deny_users > 0) {
|
|
for (i = 0; i < options.num_deny_users; i++)
|
|
if (match_pattern(pw->pw_name, options.deny_users[i]))
|
|
return 0;
|
|
}
|
|
/* Return false if AllowUsers isn't empty and user isn't listed there */
|
|
if (options.num_allow_users > 0) {
|
|
for (i = 0; i < options.num_allow_users; i++)
|
|
if (match_pattern(pw->pw_name, options.allow_users[i]))
|
|
break;
|
|
/* i < options.num_allow_users iff we break for loop */
|
|
if (i >= options.num_allow_users)
|
|
return 0;
|
|
}
|
|
if (options.num_deny_groups > 0 || options.num_allow_groups > 0) {
|
|
/* Get the user's group access list (primary and supplementary) */
|
|
if (ga_init(pw->pw_name, pw->pw_gid) == 0)
|
|
return 0;
|
|
|
|
/* Return false if one of user's groups is listed in DenyGroups */
|
|
if (options.num_deny_groups > 0)
|
|
if (ga_match(options.deny_groups,
|
|
options.num_deny_groups)) {
|
|
ga_free();
|
|
return 0;
|
|
}
|
|
/*
|
|
* Return false if AllowGroups isn't empty and one of user's groups
|
|
* isn't listed there
|
|
*/
|
|
if (options.num_allow_groups > 0)
|
|
if (!ga_match(options.allow_groups,
|
|
options.num_allow_groups)) {
|
|
ga_free();
|
|
return 0;
|
|
}
|
|
ga_free();
|
|
}
|
|
|
|
#ifdef WITH_AIXAUTHENTICATE
|
|
if (loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &loginmsg) != 0) {
|
|
if (loginmsg && *loginmsg) {
|
|
/* Remove embedded newlines (if any) */
|
|
char *p;
|
|
for (p = loginmsg; *p; p++) {
|
|
if (*p == '\n')
|
|
*p = ' ';
|
|
}
|
|
/* Remove trailing newline */
|
|
*--p = '\0';
|
|
log("Login restricted for %s: %.100s", pw->pw_name, loginmsg);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif /* WITH_AIXAUTHENTICATE */
|
|
|
|
/* We found no reason not to let this user try to log on... */
|
|
return 1;
|
|
}
|
|
|
|
Authctxt *
|
|
authctxt_new(void)
|
|
{
|
|
Authctxt *authctxt = xmalloc(sizeof(*authctxt));
|
|
memset(authctxt, 0, sizeof(*authctxt));
|
|
return authctxt;
|
|
}
|
|
|
|
struct passwd *
|
|
pwcopy(struct passwd *pw)
|
|
{
|
|
struct passwd *copy = xmalloc(sizeof(*copy));
|
|
memset(copy, 0, sizeof(*copy));
|
|
copy->pw_name = xstrdup(pw->pw_name);
|
|
copy->pw_passwd = xstrdup(pw->pw_passwd);
|
|
copy->pw_uid = pw->pw_uid;
|
|
copy->pw_gid = pw->pw_gid;
|
|
#ifdef HAVE_PW_CLASS_IN_PASSWD
|
|
copy->pw_class = xstrdup(pw->pw_class);
|
|
#endif
|
|
copy->pw_dir = xstrdup(pw->pw_dir);
|
|
copy->pw_shell = xstrdup(pw->pw_shell);
|
|
return copy;
|
|
}
|
|
|
|
void
|
|
auth_log(Authctxt *authctxt, int authenticated, char *method, char *info)
|
|
{
|
|
void (*authlog) (const char *fmt,...) = verbose;
|
|
char *authmsg;
|
|
|
|
/* Raise logging level */
|
|
if (authenticated == 1 ||
|
|
!authctxt->valid ||
|
|
authctxt->failures >= AUTH_FAIL_LOG ||
|
|
strcmp(method, "password") == 0)
|
|
authlog = log;
|
|
|
|
if (authctxt->postponed)
|
|
authmsg = "Postponed";
|
|
else
|
|
authmsg = authenticated ? "Accepted" : "Failed";
|
|
|
|
authlog("%s %s for %s%.100s from %.200s port %d%s",
|
|
authmsg,
|
|
method,
|
|
authctxt->valid ? "" : "illegal user ",
|
|
authctxt->valid && authctxt->pw->pw_uid == 0 ? "ROOT" : authctxt->user,
|
|
get_remote_ipaddr(),
|
|
get_remote_port(),
|
|
info);
|
|
}
|
|
|
|
/*
|
|
* Check if the user is logging in as root and root logins are disallowed.
|
|
* Note that root login is _allways_ allowed for forced commands.
|
|
*/
|
|
int
|
|
auth_root_allowed(void)
|
|
{
|
|
if (options.permit_root_login)
|
|
return 1;
|
|
if (forced_command) {
|
|
log("Root login accepted for forced command.");
|
|
return 1;
|
|
} else {
|
|
log("ROOT LOGIN REFUSED FROM %.200s", get_canonical_hostname());
|
|
return 0;
|
|
}
|
|
}
|