213 lines
5.0 KiB
C
213 lines
5.0 KiB
C
/* $Id: platform.c,v 1.19 2013/03/12 00:31:05 dtucker Exp $ */
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/*
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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 <sys/types.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include "log.h"
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#include "buffer.h"
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#include "servconf.h"
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#include "key.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_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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/* if solaris projects were detected, set the default now */
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if (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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#if !defined(HAVE_LOGIN_CAP) && defined(USE_LIBIAF)
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if (set_id(pw->pw_name) != 0) {
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exit(1);
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}
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# endif /* USE_LIBIAF */
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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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/*
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* return 1 if the specified uid is a uid that may own a system directory
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* otherwise 0.
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*/
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int
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platform_sys_dir_uid(uid_t uid)
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{
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if (uid == 0)
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return 1;
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#ifdef PLATFORM_SYS_DIR_UID
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if (uid == PLATFORM_SYS_DIR_UID)
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return 1;
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#endif
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return 0;
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}
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