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mirror of https://git.FreeBSD.org/src.git synced 2024-12-16 10:20:30 +00:00
freebsd/crypto/openssh/platform.c
Ed Maste 87c1498d1a ssh: update to OpenSSH v9.0p1
Release notes are available at https://www.openssh.com/txt/release-9.0

Some highlights:

 * ssh(1), sshd(8): use the hybrid Streamlined NTRU Prime + x25519 key
   exchange method by default ("sntrup761x25519-sha512@openssh.com").
   The NTRU algorithm is believed to resist attacks enabled by future
   quantum computers and is paired with the X25519 ECDH key exchange
   (the previous default) as a backstop against any weaknesses in
   NTRU Prime that may be discovered in the future. The combination
   ensures that the hybrid exchange offers at least as good security
   as the status quo.

 * sftp-server(8): support the "copy-data" extension to allow server-
   side copying of files/data, following the design in
   draft-ietf-secsh-filexfer-extensions-00. bz2948

 * sftp(1): add a "cp" command to allow the sftp client to perform
   server-side file copies.

This commit excludes the scp(1) change to use the SFTP protocol by
default; that change will immediately follow.

MFC after:	1 month
Relnotes:	Yes
Sponsored by:	The FreeBSD Foundation
2022-04-15 10:41:08 -04:00

251 lines
5.8 KiB
C

/*
* Copyright (c) 2006 Darren Tucker. All rights reserved.
*
* Permission to use, copy, modify, and 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.
*/
#include "includes.h"
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "log.h"
#include "misc.h"
#include "servconf.h"
#include "sshkey.h"
#include "hostfile.h"
#include "auth.h"
#include "auth-pam.h"
#include "platform.h"
#include "openbsd-compat/openbsd-compat.h"
extern int use_privsep;
extern ServerOptions options;
void
platform_pre_listen(void)
{
#ifdef LINUX_OOM_ADJUST
/* Adjust out-of-memory killer so listening process is not killed */
oom_adjust_setup();
#endif
}
void
platform_pre_fork(void)
{
#ifdef USE_SOLARIS_PROCESS_CONTRACTS
solaris_contract_pre_fork();
#endif
}
void
platform_pre_restart(void)
{
#ifdef LINUX_OOM_ADJUST
oom_adjust_restore();
#endif
}
void
platform_post_fork_parent(pid_t child_pid)
{
#ifdef USE_SOLARIS_PROCESS_CONTRACTS
solaris_contract_post_fork_parent(child_pid);
#endif
}
void
platform_post_fork_child(void)
{
#ifdef USE_SOLARIS_PROCESS_CONTRACTS
solaris_contract_post_fork_child();
#endif
#ifdef LINUX_OOM_ADJUST
oom_adjust_restore();
#endif
}
/* return 1 if we are running with privilege to swap UIDs, 0 otherwise */
int
platform_privileged_uidswap(void)
{
#ifdef HAVE_CYGWIN
/* uid 0 is not special on Cygwin so always try */
return 1;
#else
return (getuid() == 0 || geteuid() == 0);
#endif
}
/*
* This gets called before switching UIDs, and is called even when sshd is
* not running as root.
*/
void
platform_setusercontext(struct passwd *pw)
{
#ifdef WITH_SELINUX
/* Cache selinux status for later use */
(void)ssh_selinux_enabled();
#endif
#ifdef USE_SOLARIS_PROJECTS
/*
* If solaris projects were detected, set the default now, unless
* we are using PAM in which case it is the responsibility of the
* PAM stack.
*/
if (!options.use_pam && (getuid() == 0 || geteuid() == 0))
solaris_set_default_project(pw);
#endif
#if defined(HAVE_LOGIN_CAP) && defined (__bsdi__)
if (getuid() == 0 || geteuid() == 0)
setpgid(0, 0);
# endif
#if defined(HAVE_LOGIN_CAP) && defined(USE_PAM)
/*
* If we have both LOGIN_CAP and PAM, we want to establish creds
* before calling setusercontext (in session.c:do_setusercontext).
*/
if (getuid() == 0 || geteuid() == 0) {
if (options.use_pam) {
do_pam_setcred(use_privsep);
}
}
# endif /* USE_PAM */
#if !defined(HAVE_LOGIN_CAP) && defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
if (getuid() == 0 || geteuid() == 0) {
/* Sets login uid for accounting */
if (getluid() == -1 && setluid(pw->pw_uid) == -1)
error("setluid: %s", strerror(errno));
}
#endif
}
/*
* This gets called after we've established the user's groups, and is only
* called if sshd is running as root.
*/
void
platform_setusercontext_post_groups(struct passwd *pw)
{
#if !defined(HAVE_LOGIN_CAP) && defined(USE_PAM)
/*
* PAM credentials may take the form of supplementary groups.
* These will have been wiped by the above initgroups() call.
* Reestablish them here.
*/
if (options.use_pam) {
do_pam_setcred(use_privsep);
}
#endif /* USE_PAM */
#if !defined(HAVE_LOGIN_CAP) && (defined(WITH_IRIX_PROJECT) || \
defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY))
irix_setusercontext(pw);
#endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
#ifdef _AIX
aix_usrinfo(pw);
#endif /* _AIX */
#ifdef HAVE_SETPCRED
/*
* If we have a chroot directory, we set all creds except real
* uid which we will need for chroot. If we don't have a
* chroot directory, we don't override anything.
*/
{
char **creds = NULL, *chroot_creds[] =
{ "REAL_USER=root", NULL };
if (options.chroot_directory != NULL &&
strcasecmp(options.chroot_directory, "none") != 0)
creds = chroot_creds;
if (setpcred(pw->pw_name, creds) == -1)
fatal("Failed to set process credentials");
}
#endif /* HAVE_SETPCRED */
#ifdef WITH_SELINUX
ssh_selinux_setup_exec_context(pw->pw_name);
#endif
}
char *
platform_krb5_get_principal_name(const char *pw_name)
{
#ifdef USE_AIX_KRB_NAME
return aix_krb5_get_principal_name(pw_name);
#else
return NULL;
#endif
}
/* returns 1 if account is locked */
int
platform_locked_account(struct passwd *pw)
{
int locked = 0;
char *passwd = pw->pw_passwd;
#ifdef USE_SHADOW
struct spwd *spw = NULL;
#ifdef USE_LIBIAF
char *iaf_passwd = NULL;
#endif
spw = getspnam(pw->pw_name);
#ifdef HAS_SHADOW_EXPIRE
if (spw != NULL && auth_shadow_acctexpired(spw))
return 1;
#endif /* HAS_SHADOW_EXPIRE */
if (spw != NULL)
#ifdef USE_LIBIAF
iaf_passwd = passwd = get_iaf_password(pw);
#else
passwd = spw->sp_pwdp;
#endif /* USE_LIBIAF */
#endif
/* check for locked account */
if (passwd && *passwd) {
#ifdef LOCKED_PASSWD_STRING
if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0)
locked = 1;
#endif
#ifdef LOCKED_PASSWD_PREFIX
if (strncmp(passwd, LOCKED_PASSWD_PREFIX,
strlen(LOCKED_PASSWD_PREFIX)) == 0)
locked = 1;
#endif
#ifdef LOCKED_PASSWD_SUBSTR
if (strstr(passwd, LOCKED_PASSWD_SUBSTR))
locked = 1;
#endif
}
#ifdef USE_LIBIAF
if (iaf_passwd != NULL)
freezero(iaf_passwd, strlen(iaf_passwd));
#endif /* USE_LIBIAF */
return locked;
}