1 /* $Id: platform.c,v 1.22 2014/07/18 04:11:26 djm Exp $ */
4 * Copyright (c) 2006 Darren Tucker. All rights reserved.
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 #include <sys/types.h>
36 #include "openbsd-compat/openbsd-compat.h"
38 extern int use_privsep;
39 extern ServerOptions options;
42 platform_pre_listen(void)
44 #ifdef LINUX_OOM_ADJUST
45 /* Adjust out-of-memory killer so listening process is not killed */
51 platform_pre_fork(void)
53 #ifdef USE_SOLARIS_PROCESS_CONTRACTS
54 solaris_contract_pre_fork();
59 platform_pre_restart(void)
61 #ifdef LINUX_OOM_ADJUST
67 platform_post_fork_parent(pid_t child_pid)
69 #ifdef USE_SOLARIS_PROCESS_CONTRACTS
70 solaris_contract_post_fork_parent(child_pid);
75 platform_post_fork_child(void)
77 #ifdef USE_SOLARIS_PROCESS_CONTRACTS
78 solaris_contract_post_fork_child();
80 #ifdef LINUX_OOM_ADJUST
85 /* return 1 if we are running with privilege to swap UIDs, 0 otherwise */
87 platform_privileged_uidswap(void)
90 /* uid 0 is not special on Cygwin so always try */
93 return (getuid() == 0 || geteuid() == 0);
98 * This gets called before switching UIDs, and is called even when sshd is
99 * not running as root.
102 platform_setusercontext(struct passwd *pw)
105 /* Cache selinux status for later use */
106 (void)ssh_selinux_enabled();
109 #ifdef USE_SOLARIS_PROJECTS
110 /* if solaris projects were detected, set the default now */
111 if (getuid() == 0 || geteuid() == 0)
112 solaris_set_default_project(pw);
115 #if defined(HAVE_LOGIN_CAP) && defined (__bsdi__)
116 if (getuid() == 0 || geteuid() == 0)
120 #if defined(HAVE_LOGIN_CAP) && defined(USE_PAM)
122 * If we have both LOGIN_CAP and PAM, we want to establish creds
123 * before calling setusercontext (in session.c:do_setusercontext).
125 if (getuid() == 0 || geteuid() == 0) {
126 if (options.use_pam) {
127 do_pam_setcred(use_privsep);
130 # endif /* USE_PAM */
132 #if !defined(HAVE_LOGIN_CAP) && defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
133 if (getuid() == 0 || geteuid() == 0) {
134 /* Sets login uid for accounting */
135 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
136 error("setluid: %s", strerror(errno));
142 * This gets called after we've established the user's groups, and is only
143 * called if sshd is running as root.
146 platform_setusercontext_post_groups(struct passwd *pw)
148 #if !defined(HAVE_LOGIN_CAP) && defined(USE_PAM)
150 * PAM credentials may take the form of supplementary groups.
151 * These will have been wiped by the above initgroups() call.
152 * Reestablish them here.
154 if (options.use_pam) {
155 do_pam_setcred(use_privsep);
159 #if !defined(HAVE_LOGIN_CAP) && (defined(WITH_IRIX_PROJECT) || \
160 defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY))
161 irix_setusercontext(pw);
162 #endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
170 * If we have a chroot directory, we set all creds except real
171 * uid which we will need for chroot. If we don't have a
172 * chroot directory, we don't override anything.
175 char **creds = NULL, *chroot_creds[] =
176 { "REAL_USER=root", NULL };
178 if (options.chroot_directory != NULL &&
179 strcasecmp(options.chroot_directory, "none") != 0)
180 creds = chroot_creds;
182 if (setpcred(pw->pw_name, creds) == -1)
183 fatal("Failed to set process credentials");
185 #endif /* HAVE_SETPCRED */
187 ssh_selinux_setup_exec_context(pw->pw_name);
192 platform_krb5_get_principal_name(const char *pw_name)
194 #ifdef USE_AIX_KRB_NAME
195 return aix_krb5_get_principal_name(pw_name);
202 * return 1 if the specified uid is a uid that may own a system directory
206 platform_sys_dir_uid(uid_t uid)
210 #ifdef PLATFORM_SYS_DIR_UID
211 if (uid == PLATFORM_SYS_DIR_UID)