diff -up openssh-7.4p1/openbsd-compat/port-linux.h.privsep-selinux openssh-7.4p1/openbsd-compat/port-linux.h --- openssh-7.4p1/openbsd-compat/port-linux.h.privsep-selinux 2016-12-23 18:58:52.972122201 +0100 +++ openssh-7.4p1/openbsd-compat/port-linux.h 2016-12-23 18:58:52.974122201 +0100 @@ -23,6 +23,7 @@ void ssh_selinux_setup_pty(char *, const void ssh_selinux_change_context(const char *); void ssh_selinux_setfscreatecon(const char *); +void sshd_selinux_copy_context(void); void sshd_selinux_setup_exec_context(char *); #endif diff -up openssh-7.4p1/openbsd-compat/port-linux-sshd.c.privsep-selinux openssh-7.4p1/openbsd-compat/port-linux-sshd.c --- openssh-7.4p1/openbsd-compat/port-linux-sshd.c.privsep-selinux 2016-12-23 18:58:52.973122201 +0100 +++ openssh-7.4p1/openbsd-compat/port-linux-sshd.c 2016-12-23 18:58:52.974122201 +0100 @@ -419,6 +419,28 @@ sshd_selinux_setup_exec_context(char *pw debug3("%s: done", __func__); } +void +sshd_selinux_copy_context(void) +{ + security_context_t *ctx; + + if (!ssh_selinux_enabled()) + return; + + if (getexeccon((security_context_t *)&ctx) != 0) { + logit("%s: getexeccon failed with %s", __func__, strerror(errno)); + return; + } + if (ctx != NULL) { + /* unset exec context before we will lose this capabililty */ + if (setexeccon(NULL) != 0) + fatal("%s: setexeccon failed with %s", __func__, strerror(errno)); + if (setcon(ctx) != 0) + fatal("%s: setcon failed with %s", __func__, strerror(errno)); + freecon(ctx); + } +} + #endif #endif diff -up openssh-7.4p1/session.c.privsep-selinux openssh-7.4p1/session.c --- openssh-7.4p1/session.c.privsep-selinux 2016-12-19 05:59:41.000000000 +0100 +++ openssh-7.4p1/session.c 2016-12-23 18:58:52.974122201 +0100 @@ -1331,7 +1331,7 @@ do_setusercontext(struct passwd *pw) platform_setusercontext(pw); - if (platform_privileged_uidswap()) { + if (platform_privileged_uidswap() && (!is_child || !use_privsep)) { #ifdef HAVE_LOGIN_CAP if (setusercontext(lc, pw, pw->pw_uid, (LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETUSER))) < 0) { @@ -1361,6 +1361,9 @@ do_setusercontext(struct passwd *pw) (unsigned long long)pw->pw_uid); chroot_path = percent_expand(tmp, "h", pw->pw_dir, "u", pw->pw_name, "U", uidstr, (char *)NULL); +#ifdef WITH_SELINUX + sshd_selinux_copy_context(); +#endif safely_chroot(chroot_path, pw->pw_uid); free(tmp); free(chroot_path); @@ -1396,6 +1399,11 @@ do_setusercontext(struct passwd *pw) /* Permanently switch to the desired uid. */ permanently_set_uid(pw); #endif + +#ifdef WITH_SELINUX + if (in_chroot == 0) + sshd_selinux_copy_context(); +#endif } else if (options.chroot_directory != NULL && strcasecmp(options.chroot_directory, "none") != 0) { fatal("server lacks privileges to chroot to ChrootDirectory"); @@ -1413,9 +1421,6 @@ do_pwchange(Session *s) if (s->ttyfd != -1) { fprintf(stderr, "You must change your password now and login again!\n"); -#ifdef WITH_SELINUX - setexeccon(NULL); -#endif #ifdef PASSWD_NEEDS_USERNAME execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, (char *)NULL); @@ -1625,9 +1630,6 @@ do_child(Session *s, const char *command argv[i] = NULL; optind = optreset = 1; __progname = argv[0]; -#ifdef WITH_SELINUX - ssh_selinux_change_context("sftpd_t"); -#endif exit(sftp_server_main(i, argv, s->pw)); } diff -up openssh-7.4p1/sshd.c.privsep-selinux openssh-7.4p1/sshd.c --- openssh-7.4p1/sshd.c.privsep-selinux 2016-12-23 18:58:52.973122201 +0100 +++ openssh-7.4p1/sshd.c 2016-12-23 18:59:13.808124269 +0100 @@ -540,6 +540,10 @@ privsep_preauth_child(void) /* Demote the private keys to public keys. */ demote_sensitive_data(); +#ifdef WITH_SELINUX + ssh_selinux_change_context("sshd_net_t"); +#endif + /* Demote the child */ if (privsep_chroot) { /* Change our root directory */ @@ -633,6 +637,9 @@ privsep_postauth(Authctxt *authctxt) { #ifdef DISABLE_FD_PASSING if (1) { +#elif defined(WITH_SELINUX) + if (0) { + /* even root user can be confined by SELinux */ #else if (authctxt->pw->pw_uid == 0) { #endif