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