4 * Copyright (c) 2005 Daniel Walsh <dwalsh@redhat.com>
5 * Copyright (c) 2006 Damien Miller <djm@openbsd.org>
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 * Linux-specific portability code - just SELinux support at present
32 #include "port-linux.h"
34 #include <selinux/selinux.h>
35 #include <selinux/flask.h>
36 #include <selinux/get_context_list.h>
38 /* Wrapper around is_selinux_enabled() to log its return value once only */
40 ssh_selinux_enabled(void)
42 static int enabled = -1;
45 enabled = is_selinux_enabled();
46 debug("SELinux support %s", enabled ? "enabled" : "disabled");
52 /* Return the default security context for the given username */
53 static security_context_t
54 ssh_selinux_getctxbyname(char *pwname)
56 security_context_t sc;
57 char *sename = NULL, *lvl = NULL;
60 #ifdef HAVE_GETSEUSERBYNAME
61 if (getseuserbyname(pwname, &sename, &lvl) != 0)
68 #ifdef HAVE_GET_DEFAULT_CONTEXT_WITH_LEVEL
69 r = get_default_context_with_level(sename, lvl, NULL, &sc);
71 r = get_default_context(sename, NULL, &sc);
75 switch (security_getenforce()) {
77 fatal("%s: ssh_selinux_getctxbyname: "
78 "security_getenforce() failed", __func__);
80 error("%s: Failed to get default SELinux security "
81 "context for %s", __func__, pwname);
84 fatal("%s: Failed to get default SELinux security "
85 "context for %s (in enforcing mode)",
90 #ifdef HAVE_GETSEUSERBYNAME
100 /* Set the execution context to the default for the specified user */
102 ssh_selinux_setup_exec_context(char *pwname)
104 security_context_t user_ctx = NULL;
106 if (!ssh_selinux_enabled())
109 debug3("%s: setting execution context", __func__);
111 user_ctx = ssh_selinux_getctxbyname(pwname);
112 if (setexeccon(user_ctx) != 0) {
113 switch (security_getenforce()) {
115 fatal("%s: security_getenforce() failed", __func__);
117 error("%s: Failed to set SELinux execution "
118 "context for %s", __func__, pwname);
121 fatal("%s: Failed to set SELinux execution context "
122 "for %s (in enforcing mode)", __func__, pwname);
125 if (user_ctx != NULL)
128 debug3("%s: done", __func__);
131 /* Set the TTY context for the specified user */
133 ssh_selinux_setup_pty(char *pwname, const char *tty)
135 security_context_t new_tty_ctx = NULL;
136 security_context_t user_ctx = NULL;
137 security_context_t old_tty_ctx = NULL;
139 if (!ssh_selinux_enabled())
142 debug3("%s: setting TTY context on %s", __func__, tty);
144 user_ctx = ssh_selinux_getctxbyname(pwname);
146 /* XXX: should these calls fatal() upon failure in enforcing mode? */
148 if (getfilecon(tty, &old_tty_ctx) == -1) {
149 error("%s: getfilecon: %s", __func__, strerror(errno));
153 if (security_compute_relabel(user_ctx, old_tty_ctx,
154 SECCLASS_CHR_FILE, &new_tty_ctx) != 0) {
155 error("%s: security_compute_relabel: %s",
156 __func__, strerror(errno));
160 if (setfilecon(tty, new_tty_ctx) != 0)
161 error("%s: setfilecon: %s", __func__, strerror(errno));
163 if (new_tty_ctx != NULL)
164 freecon(new_tty_ctx);
165 if (old_tty_ctx != NULL)
166 freecon(old_tty_ctx);
167 if (user_ctx != NULL)
169 debug3("%s: done", __func__);
171 #endif /* WITH_SELINUX */