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215 lines
5.0 KiB
215 lines
5.0 KiB
/* |
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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 <unistd.h> |
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#include "log.h" |
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#include "buffer.h" |
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#include "misc.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_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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/* |
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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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