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87c1498d1a
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
251 lines
5.8 KiB
C
251 lines
5.8 KiB
C
/*
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* Copyright (c) 2006 Darren Tucker. All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "includes.h"
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "log.h"
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#include "misc.h"
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#include "servconf.h"
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#include "sshkey.h"
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#include "hostfile.h"
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#include "auth.h"
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#include "auth-pam.h"
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#include "platform.h"
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#include "openbsd-compat/openbsd-compat.h"
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extern int use_privsep;
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extern ServerOptions options;
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void
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platform_pre_listen(void)
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{
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#ifdef LINUX_OOM_ADJUST
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/* Adjust out-of-memory killer so listening process is not killed */
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oom_adjust_setup();
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#endif
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}
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void
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platform_pre_fork(void)
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{
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#ifdef USE_SOLARIS_PROCESS_CONTRACTS
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solaris_contract_pre_fork();
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#endif
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}
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void
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platform_pre_restart(void)
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{
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#ifdef LINUX_OOM_ADJUST
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oom_adjust_restore();
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#endif
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}
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void
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platform_post_fork_parent(pid_t child_pid)
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{
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#ifdef USE_SOLARIS_PROCESS_CONTRACTS
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solaris_contract_post_fork_parent(child_pid);
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#endif
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}
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void
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platform_post_fork_child(void)
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{
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#ifdef USE_SOLARIS_PROCESS_CONTRACTS
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solaris_contract_post_fork_child();
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#endif
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#ifdef LINUX_OOM_ADJUST
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oom_adjust_restore();
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#endif
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}
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/* return 1 if we are running with privilege to swap UIDs, 0 otherwise */
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int
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platform_privileged_uidswap(void)
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{
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#ifdef HAVE_CYGWIN
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/* uid 0 is not special on Cygwin so always try */
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return 1;
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#else
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return (getuid() == 0 || geteuid() == 0);
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#endif
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}
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/*
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* This gets called before switching UIDs, and is called even when sshd is
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* not running as root.
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*/
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void
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platform_setusercontext(struct passwd *pw)
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{
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#ifdef WITH_SELINUX
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/* Cache selinux status for later use */
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(void)ssh_selinux_enabled();
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#endif
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#ifdef USE_SOLARIS_PROJECTS
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/*
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* If solaris projects were detected, set the default now, unless
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* we are using PAM in which case it is the responsibility of the
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* PAM stack.
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*/
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if (!options.use_pam && (getuid() == 0 || geteuid() == 0))
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solaris_set_default_project(pw);
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#endif
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#if defined(HAVE_LOGIN_CAP) && defined (__bsdi__)
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if (getuid() == 0 || geteuid() == 0)
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setpgid(0, 0);
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# endif
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#if defined(HAVE_LOGIN_CAP) && defined(USE_PAM)
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/*
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* If we have both LOGIN_CAP and PAM, we want to establish creds
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* before calling setusercontext (in session.c:do_setusercontext).
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*/
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if (getuid() == 0 || geteuid() == 0) {
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if (options.use_pam) {
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do_pam_setcred(use_privsep);
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}
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}
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# endif /* USE_PAM */
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#if !defined(HAVE_LOGIN_CAP) && defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
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if (getuid() == 0 || geteuid() == 0) {
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/* Sets login uid for accounting */
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if (getluid() == -1 && setluid(pw->pw_uid) == -1)
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error("setluid: %s", strerror(errno));
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}
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#endif
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}
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/*
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* This gets called after we've established the user's groups, and is only
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* called if sshd is running as root.
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*/
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void
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platform_setusercontext_post_groups(struct passwd *pw)
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{
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#if !defined(HAVE_LOGIN_CAP) && defined(USE_PAM)
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/*
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* PAM credentials may take the form of supplementary groups.
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* These will have been wiped by the above initgroups() call.
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* Reestablish them here.
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*/
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if (options.use_pam) {
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do_pam_setcred(use_privsep);
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}
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#endif /* USE_PAM */
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#if !defined(HAVE_LOGIN_CAP) && (defined(WITH_IRIX_PROJECT) || \
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defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY))
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irix_setusercontext(pw);
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#endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
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#ifdef _AIX
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aix_usrinfo(pw);
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#endif /* _AIX */
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#ifdef HAVE_SETPCRED
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/*
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* If we have a chroot directory, we set all creds except real
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* uid which we will need for chroot. If we don't have a
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* chroot directory, we don't override anything.
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*/
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{
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char **creds = NULL, *chroot_creds[] =
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{ "REAL_USER=root", NULL };
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if (options.chroot_directory != NULL &&
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strcasecmp(options.chroot_directory, "none") != 0)
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creds = chroot_creds;
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if (setpcred(pw->pw_name, creds) == -1)
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fatal("Failed to set process credentials");
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}
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#endif /* HAVE_SETPCRED */
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#ifdef WITH_SELINUX
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ssh_selinux_setup_exec_context(pw->pw_name);
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#endif
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}
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char *
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platform_krb5_get_principal_name(const char *pw_name)
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{
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#ifdef USE_AIX_KRB_NAME
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return aix_krb5_get_principal_name(pw_name);
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#else
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return NULL;
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#endif
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}
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/* returns 1 if account is locked */
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int
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platform_locked_account(struct passwd *pw)
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{
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int locked = 0;
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char *passwd = pw->pw_passwd;
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#ifdef USE_SHADOW
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struct spwd *spw = NULL;
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#ifdef USE_LIBIAF
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char *iaf_passwd = NULL;
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#endif
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spw = getspnam(pw->pw_name);
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#ifdef HAS_SHADOW_EXPIRE
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if (spw != NULL && auth_shadow_acctexpired(spw))
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return 1;
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#endif /* HAS_SHADOW_EXPIRE */
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if (spw != NULL)
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#ifdef USE_LIBIAF
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iaf_passwd = passwd = get_iaf_password(pw);
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#else
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passwd = spw->sp_pwdp;
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#endif /* USE_LIBIAF */
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#endif
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/* check for locked account */
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if (passwd && *passwd) {
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#ifdef LOCKED_PASSWD_STRING
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if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0)
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locked = 1;
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#endif
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#ifdef LOCKED_PASSWD_PREFIX
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if (strncmp(passwd, LOCKED_PASSWD_PREFIX,
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strlen(LOCKED_PASSWD_PREFIX)) == 0)
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locked = 1;
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#endif
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#ifdef LOCKED_PASSWD_SUBSTR
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if (strstr(passwd, LOCKED_PASSWD_SUBSTR))
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locked = 1;
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#endif
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}
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#ifdef USE_LIBIAF
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if (iaf_passwd != NULL)
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freezero(iaf_passwd, strlen(iaf_passwd));
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#endif /* USE_LIBIAF */
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return locked;
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}
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