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a3ba41c854
openssh/openssh-5.2p1-selinux.patch
Jan F. Chadima a3ba41c854 Bounce openssh to version 5.2p1
2009-03-10 11:54:44 +00:00

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diff -up openssh-5.2p1/auth1.c.selinux openssh-5.2p1/auth1.c
--- openssh-5.2p1/auth1.c.selinux 2009-03-10 03:51:54.813223420 +0100
+++ openssh-5.2p1/auth1.c 2009-03-10 03:51:55.045214236 +0100
@@ -391,7 +391,7 @@ void
do_authentication(Authctxt *authctxt)
{
u_int ulen;
- char *user, *style = NULL;
+ char *user, *style = NULL, *role=NULL;
/* Get the name of the user that we wish to log in as. */
packet_read_expect(SSH_CMSG_USER);
@@ -400,11 +400,19 @@ do_authentication(Authctxt *authctxt)
user = packet_get_string(&ulen);
packet_check_eom();
+ if ((role = strchr(user, '/')) != NULL)
+ *role++ = '\0';
+
if ((style = strchr(user, ':')) != NULL)
*style++ = '\0';
+ else
+ if (role && (style = strchr(role, ':')) != NULL)
+ *style++ = '\0';
+
authctxt->user = user;
authctxt->style = style;
+ authctxt->role = role;
/* Verify that the user is a valid user. */
if ((authctxt->pw = PRIVSEP(getpwnamallow(user))) != NULL)
diff -up openssh-5.2p1/auth2.c.selinux openssh-5.2p1/auth2.c
--- openssh-5.2p1/auth2.c.selinux 2008-11-05 06:20:46.000000000 +0100
+++ openssh-5.2p1/auth2.c 2009-03-10 03:51:55.071216534 +0100
@@ -215,7 +215,7 @@ input_userauth_request(int type, u_int32
{
Authctxt *authctxt = ctxt;
Authmethod *m = NULL;
- char *user, *service, *method, *style = NULL;
+ char *user, *service, *method, *style = NULL, *role = NULL;
int authenticated = 0;
if (authctxt == NULL)
@@ -227,6 +227,9 @@ input_userauth_request(int type, u_int32
debug("userauth-request for user %s service %s method %s", user, service, method);
debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
+ if ((role = strchr(user, '/')) != NULL)
+ *role++ = 0;
+
if ((style = strchr(user, ':')) != NULL)
*style++ = 0;
@@ -252,8 +255,11 @@ input_userauth_request(int type, u_int32
use_privsep ? " [net]" : "");
authctxt->service = xstrdup(service);
authctxt->style = style ? xstrdup(style) : NULL;
- if (use_privsep)
+ authctxt->role = role ? xstrdup(role) : NULL;
+ if (use_privsep) {
mm_inform_authserv(service, style);
+ mm_inform_authrole(role);
+ }
userauth_banner();
} else if (strcmp(user, authctxt->user) != 0 ||
strcmp(service, authctxt->service) != 0) {
diff -up openssh-5.2p1/auth2-hostbased.c.selinux openssh-5.2p1/auth2-hostbased.c
--- openssh-5.2p1/auth2-hostbased.c.selinux 2008-07-17 10:57:19.000000000 +0200
+++ openssh-5.2p1/auth2-hostbased.c 2009-03-10 03:51:55.052265447 +0100
@@ -106,7 +106,14 @@ userauth_hostbased(Authctxt *authctxt)
buffer_put_string(&b, session_id2, session_id2_len);
/* reconstruct packet */
buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
- buffer_put_cstring(&b, authctxt->user);
+ if (authctxt->role) {
+ buffer_put_int(&b, strlen(authctxt->user)+strlen(authctxt->role)+1);
+ buffer_append(&b, authctxt->user, strlen(authctxt->user));
+ buffer_put_char(&b, '/');
+ buffer_append(&b, authctxt->role, strlen(authctxt->role));
+ } else {
+ buffer_put_cstring(&b, authctxt->user);
+ }
buffer_put_cstring(&b, service);
buffer_put_cstring(&b, "hostbased");
buffer_put_string(&b, pkalg, alen);
diff -up openssh-5.2p1/auth2-pubkey.c.selinux openssh-5.2p1/auth2-pubkey.c
--- openssh-5.2p1/auth2-pubkey.c.selinux 2008-07-04 04:54:25.000000000 +0200
+++ openssh-5.2p1/auth2-pubkey.c 2009-03-10 03:51:56.174214480 +0100
@@ -33,6 +33,7 @@
#include <stdio.h>
#include <stdarg.h>
#include <unistd.h>
+#include <openssl/fips.h>
#include "xmalloc.h"
#include "ssh.h"
@@ -117,7 +118,14 @@ userauth_pubkey(Authctxt *authctxt)
}
/* reconstruct packet */
buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
- buffer_put_cstring(&b, authctxt->user);
+ if (authctxt->role) {
+ buffer_put_int(&b, strlen(authctxt->user)+strlen(authctxt->role)+1);
+ buffer_append(&b, authctxt->user, strlen(authctxt->user));
+ buffer_put_char(&b, '/');
+ buffer_append(&b, authctxt->role, strlen(authctxt->role));
+ } else {
+ buffer_put_cstring(&b, authctxt->user);
+ }
buffer_put_cstring(&b,
datafellows & SSH_BUG_PKSERVICE ?
"ssh-userauth" :
@@ -236,7 +244,7 @@ user_key_allowed2(struct passwd *pw, Key
found_key = 1;
debug("matching key found: file %s, line %lu",
file, linenum);
- fp = key_fingerprint(found, SSH_FP_MD5, SSH_FP_HEX);
+ fp = key_fingerprint(found, FIPS_mode() ? SSH_FP_SHA1 : SSH_FP_MD5, SSH_FP_HEX);
verbose("Found matching %s key: %s",
key_type(found), fp);
xfree(fp);
diff -up openssh-5.2p1/auth.h.selinux openssh-5.2p1/auth.h
--- openssh-5.2p1/auth.h.selinux 2008-11-05 06:20:46.000000000 +0100
+++ openssh-5.2p1/auth.h 2009-03-10 03:51:55.069276014 +0100
@@ -58,6 +58,7 @@ struct Authctxt {
char *service;
struct passwd *pw; /* set if 'valid' */
char *style;
+ char *role;
void *kbdintctxt;
void *jpake_ctx;
#ifdef BSD_AUTH
diff -up openssh-5.2p1/configure.ac.selinux openssh-5.2p1/configure.ac
--- openssh-5.2p1/configure.ac.selinux 2009-03-10 03:51:54.901396765 +0100
+++ openssh-5.2p1/configure.ac 2009-03-10 03:51:55.850215090 +0100
@@ -3335,11 +3335,25 @@ AC_ARG_WITH(selinux,
AC_CHECK_LIB(selinux, setexeccon, [ LIBSELINUX="-lselinux" ],
AC_MSG_ERROR(SELinux support requires libselinux library))
SSHDLIBS="$SSHDLIBS $LIBSELINUX"
+ LIBS="$LIBS $LIBSELINUX"
AC_CHECK_FUNCS(getseuserbyname get_default_context_with_level)
+ AC_CHECK_FUNCS(setkeycreatecon)
LIBS="$save_LIBS"
fi ]
)
+# Check whether user wants Linux audit support
+LINUX_AUDIT_MSG="no"
+AC_ARG_WITH(linux-audit,
+ [ --with-linux-audit Enable Linux audit support],
+ [ if test "x$withval" != "xno" ; then
+ AC_DEFINE(HAVE_LINUX_AUDIT,1,[Define if you want Linux audit support.])
+ LINUX_AUDIT_MSG="yes"
+ AC_CHECK_HEADERS(libaudit.h)
+ SSHDLIBS="$SSHDLIBS -laudit"
+ fi ]
+)
+
# Check whether user wants Kerberos 5 support
KRB5_MSG="no"
AC_ARG_WITH(kerberos5,
@@ -3448,6 +3462,20 @@ AC_ARG_WITH(kerberos5,
]
)
+# Check whether user wants NSS support
+LIBNSS_MSG="no"
+AC_ARG_WITH(nss,
+ [ --with-nss Enable NSS support],
+ [ if test "x$withval" != "xno" ; then
+ AC_DEFINE(HAVE_LIBNSS,1,[Define if you want NSS support.])
+ LIBNSS_MSG="yes"
+ CPPFLAGS="$CPPFLAGS -I/usr/include/nss3 -I/usr/include/nspr4"
+ AC_CHECK_HEADERS(pk11pub.h)
+ LIBS="$LIBS -lnss3"
+ fi
+ ])
+AC_SUBST(LIBNSS)
+
# Looking for programs, paths and files
PRIVSEP_PATH=/var/empty
@@ -4168,12 +4196,14 @@ echo " PAM support
echo " OSF SIA support: $SIA_MSG"
echo " KerberosV support: $KRB5_MSG"
echo " SELinux support: $SELINUX_MSG"
+echo " Linux audit support: $LINUX_AUDIT_MSG"
echo " Smartcard support: $SCARD_MSG"
echo " S/KEY support: $SKEY_MSG"
echo " TCP Wrappers support: $TCPW_MSG"
echo " MD5 password support: $MD5_MSG"
echo " libedit support: $LIBEDIT_MSG"
echo " Solaris process contract support: $SPC_MSG"
+echo " NSS support: $LIBNSS_MSG"
echo " IP address in \$DISPLAY hack: $DISPLAY_HACK_MSG"
echo " Translate v4 in v6 hack: $IPV4_IN6_HACK_MSG"
echo " BSD Auth support: $BSD_AUTH_MSG"
diff -up openssh-5.2p1/monitor.c.selinux openssh-5.2p1/monitor.c
--- openssh-5.2p1/monitor.c.selinux 2009-02-14 06:33:31.000000000 +0100
+++ openssh-5.2p1/monitor.c 2009-03-10 03:51:55.099559692 +0100
@@ -135,6 +135,7 @@ int mm_answer_sign(int, Buffer *);
int mm_answer_pwnamallow(int, Buffer *);
int mm_answer_auth2_read_banner(int, Buffer *);
int mm_answer_authserv(int, Buffer *);
+int mm_answer_authrole(int, Buffer *);
int mm_answer_authpassword(int, Buffer *);
int mm_answer_bsdauthquery(int, Buffer *);
int mm_answer_bsdauthrespond(int, Buffer *);
@@ -211,6 +212,7 @@ struct mon_table mon_dispatch_proto20[]
{MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
{MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
{MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
+ {MONITOR_REQ_AUTHROLE, MON_ONCE, mm_answer_authrole},
{MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
{MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
#ifdef USE_PAM
@@ -680,6 +682,7 @@ mm_answer_pwnamallow(int sock, Buffer *m
else {
/* Allow service/style information on the auth context */
monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
+ monitor_permit(mon_dispatch, MONITOR_REQ_AUTHROLE, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
}
@@ -725,6 +728,23 @@ mm_answer_authserv(int sock, Buffer *m)
}
int
+mm_answer_authrole(int sock, Buffer *m)
+{
+ monitor_permit_authentications(1);
+
+ authctxt->role = buffer_get_string(m, NULL);
+ debug3("%s: role=%s",
+ __func__, authctxt->role);
+
+ if (strlen(authctxt->role) == 0) {
+ xfree(authctxt->role);
+ authctxt->role = NULL;
+ }
+
+ return (0);
+}
+
+int
mm_answer_authpassword(int sock, Buffer *m)
{
static int call_count;
@@ -1102,7 +1122,7 @@ static int
monitor_valid_userblob(u_char *data, u_int datalen)
{
Buffer b;
- char *p;
+ char *p, *r;
u_int len;
int fail = 0;
@@ -1128,6 +1148,8 @@ monitor_valid_userblob(u_char *data, u_i
if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
fail++;
p = buffer_get_string(&b, NULL);
+ if ((r = strchr(p, '/')) != NULL)
+ *r = '\0';
if (strcmp(authctxt->user, p) != 0) {
logit("wrong user name passed to monitor: expected %s != %.100s",
authctxt->user, p);
@@ -1159,7 +1181,7 @@ monitor_valid_hostbasedblob(u_char *data
char *chost)
{
Buffer b;
- char *p;
+ char *p, *r;
u_int len;
int fail = 0;
@@ -1176,6 +1198,8 @@ monitor_valid_hostbasedblob(u_char *data
if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
fail++;
p = buffer_get_string(&b, NULL);
+ if ((r = strchr(p, '/')) != NULL)
+ *r = '\0';
if (strcmp(authctxt->user, p) != 0) {
logit("wrong user name passed to monitor: expected %s != %.100s",
authctxt->user, p);
diff -up openssh-5.2p1/monitor.h.selinux openssh-5.2p1/monitor.h
--- openssh-5.2p1/monitor.h.selinux 2008-11-05 06:20:46.000000000 +0100
+++ openssh-5.2p1/monitor.h 2009-03-10 03:51:55.050519421 +0100
@@ -30,7 +30,7 @@
enum monitor_reqtype {
MONITOR_REQ_MODULI, MONITOR_ANS_MODULI,
- MONITOR_REQ_FREE, MONITOR_REQ_AUTHSERV,
+ MONITOR_REQ_FREE, MONITOR_REQ_AUTHSERV,MONITOR_REQ_AUTHROLE,
MONITOR_REQ_SIGN, MONITOR_ANS_SIGN,
MONITOR_REQ_PWNAM, MONITOR_ANS_PWNAM,
MONITOR_REQ_AUTH2_READ_BANNER, MONITOR_ANS_AUTH2_READ_BANNER,
diff -up openssh-5.2p1/monitor_wrap.c.selinux openssh-5.2p1/monitor_wrap.c
--- openssh-5.2p1/monitor_wrap.c.selinux 2008-11-05 06:20:47.000000000 +0100
+++ openssh-5.2p1/monitor_wrap.c 2009-03-10 03:51:55.066210099 +0100
@@ -297,6 +297,23 @@ mm_inform_authserv(char *service, char *
buffer_free(&m);
}
+/* Inform the privileged process about role */
+
+void
+mm_inform_authrole(char *role)
+{
+ Buffer m;
+
+ debug3("%s entering", __func__);
+
+ buffer_init(&m);
+ buffer_put_cstring(&m, role ? role : "");
+
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHROLE, &m);
+
+ buffer_free(&m);
+}
+
/* Do the password authentication */
int
mm_auth_password(Authctxt *authctxt, char *password)
diff -up openssh-5.2p1/monitor_wrap.h.selinux openssh-5.2p1/monitor_wrap.h
--- openssh-5.2p1/monitor_wrap.h.selinux 2008-11-05 06:20:47.000000000 +0100
+++ openssh-5.2p1/monitor_wrap.h 2009-03-10 03:51:55.048731957 +0100
@@ -41,6 +41,7 @@ int mm_is_monitor(void);
DH *mm_choose_dh(int, int, int);
int mm_key_sign(Key *, u_char **, u_int *, u_char *, u_int);
void mm_inform_authserv(char *, char *);
+void mm_inform_authrole(char *);
struct passwd *mm_getpwnamallow(const char *);
char *mm_auth2_read_banner(void);
int mm_auth_password(struct Authctxt *, char *);
diff -up openssh-5.2p1/openbsd-compat/port-linux.c.selinux openssh-5.2p1/openbsd-compat/port-linux.c
--- openssh-5.2p1/openbsd-compat/port-linux.c.selinux 2008-03-26 21:27:21.000000000 +0100
+++ openssh-5.2p1/openbsd-compat/port-linux.c 2009-03-10 03:51:55.407292576 +0100
@@ -30,10 +30,28 @@
#ifdef WITH_SELINUX
#include "log.h"
#include "port-linux.h"
+#include "key.h"
+#include "hostfile.h"
+#include "auth.h"
+#include "xmalloc.h"
+#include "servconf.h"
#include <selinux/selinux.h>
#include <selinux/flask.h>
+#include <selinux/context.h>
#include <selinux/get_context_list.h>
+#include <selinux/get_default_type.h>
+#include <selinux/av_permissions.h>
+
+#ifdef HAVE_LINUX_AUDIT
+#include <libaudit.h>
+#include <unistd.h>
+#endif
+
+extern ServerOptions options;
+extern Authctxt *the_authctxt;
+extern int inetd_flag;
+extern int rexeced_flag;
/* Wrapper around is_selinux_enabled() to log its return value once only */
int
@@ -49,42 +67,245 @@ ssh_selinux_enabled(void)
return (enabled);
}
+/* Send audit message */
+static int
+send_audit_message(int success, security_context_t default_context,
+ security_context_t selected_context)
+{
+ int rc=0;
+#ifdef HAVE_LINUX_AUDIT
+ char *msg = NULL;
+ int audit_fd = audit_open();
+ security_context_t default_raw=NULL;
+ security_context_t selected_raw=NULL;
+ rc = -1;
+ if (audit_fd < 0) {
+ if (errno == EINVAL || errno == EPROTONOSUPPORT ||
+ errno == EAFNOSUPPORT)
+ return 0; /* No audit support in kernel */
+ error("Error connecting to audit system.");
+ return rc;
+ }
+ if (selinux_trans_to_raw_context(default_context, &default_raw) < 0) {
+ error("Error translating default context.");
+ default_raw = NULL;
+ }
+ if (selinux_trans_to_raw_context(selected_context, &selected_raw) < 0) {
+ error("Error translating selected context.");
+ selected_raw = NULL;
+ }
+ if (asprintf(&msg, "sshd: default-context=%s selected-context=%s",
+ default_raw ? default_raw : (default_context ? default_context: "?"),
+ selected_context ? selected_raw : (selected_context ? selected_context :"?")) < 0) {
+ error("Error allocating memory.");
+ goto out;
+ }
+ if (audit_log_user_message(audit_fd, AUDIT_USER_ROLE_CHANGE,
+ msg, NULL, NULL, NULL, success) <= 0) {
+ error("Error sending audit message.");
+ goto out;
+ }
+ rc = 0;
+ out:
+ free(msg);
+ freecon(default_raw);
+ freecon(selected_raw);
+ close(audit_fd);
+#endif
+ return rc;
+}
+
+static int
+mls_range_allowed(security_context_t src, security_context_t dst)
+{
+ struct av_decision avd;
+ int retval;
+ unsigned int bit = CONTEXT__CONTAINS;
+
+ debug("%s: src:%s dst:%s", __func__, src, dst);
+ retval = security_compute_av(src, dst, SECCLASS_CONTEXT, bit, &avd);
+ if (retval || ((bit & avd.allowed) != bit))
+ return 0;
+
+ return 1;
+}
+
+static int
+get_user_context(const char *sename, const char *role, const char *lvl,
+ security_context_t *sc) {
+#ifdef HAVE_GET_DEFAULT_CONTEXT_WITH_LEVEL
+ if (lvl == NULL || lvl[0] == '\0' || get_default_context_with_level(sename, lvl, NULL, sc) != 0) {
+ /* User may have requested a level completely outside of his
+ allowed range. We get a context just for auditing as the
+ range check below will certainly fail for default context. */
+#endif
+ if (get_default_context(sename, NULL, sc) != 0) {
+ *sc = NULL;
+ return -1;
+ }
+#ifdef HAVE_GET_DEFAULT_CONTEXT_WITH_LEVEL
+ }
+#endif
+ if (role != NULL && role[0]) {
+ context_t con;
+ char *type=NULL;
+ if (get_default_type(role, &type) != 0) {
+ error("get_default_type: failed to get default type for '%s'",
+ role);
+ goto out;
+ }
+ con = context_new(*sc);
+ if (!con) {
+ goto out;
+ }
+ context_role_set(con, role);
+ context_type_set(con, type);
+ freecon(*sc);
+ *sc = strdup(context_str(con));
+ context_free(con);
+ if (!*sc)
+ return -1;
+ }
+#ifdef HAVE_GET_DEFAULT_CONTEXT_WITH_LEVEL
+ if (lvl != NULL && lvl[0]) {
+ /* verify that the requested range is obtained */
+ context_t con;
+ security_context_t obtained_raw;
+ security_context_t requested_raw;
+ con = context_new(*sc);
+ if (!con) {
+ goto out;
+ }
+ context_range_set(con, lvl);
+ if (selinux_trans_to_raw_context(*sc, &obtained_raw) < 0) {
+ context_free(con);
+ goto out;
+ }
+ if (selinux_trans_to_raw_context(context_str(con), &requested_raw) < 0) {
+ freecon(obtained_raw);
+ context_free(con);
+ goto out;
+ }
+
+ debug("get_user_context: obtained context '%s' requested context '%s'",
+ obtained_raw, requested_raw);
+ if (strcmp(obtained_raw, requested_raw)) {
+ /* set the context to the real requested one but fail */
+ freecon(requested_raw);
+ freecon(obtained_raw);
+ freecon(*sc);
+ *sc = strdup(context_str(con));
+ context_free(con);
+ return -1;
+ }
+ freecon(requested_raw);
+ freecon(obtained_raw);
+ context_free(con);
+ }
+#endif
+ return 0;
+ out:
+ freecon(*sc);
+ *sc = NULL;
+ return -1;
+}
+
+static void
+ssh_selinux_get_role_level(char **role, const char **level)
+{
+ *role = NULL;
+ *level = NULL;
+ if (the_authctxt) {
+ if (the_authctxt->role != NULL) {
+ char *slash;
+ *role = xstrdup(the_authctxt->role);
+ if ((slash = strchr(*role, '/')) != NULL) {
+ *slash = '\0';
+ *level = slash + 1;
+ }
+ }
+ }
+}
+
/* Return the default security context for the given username */
-static security_context_t
-ssh_selinux_getctxbyname(char *pwname)
+static int
+ssh_selinux_getctxbyname(char *pwname,
+ security_context_t *default_sc, security_context_t *user_sc)
{
- security_context_t sc;
- char *sename = NULL, *lvl = NULL;
- int r;
+ char *sename, *lvl;
+ const char *reqlvl;
+ char *role;
+ int r = -1;
+ context_t con = NULL;
+
+ *default_sc = NULL;
+ *user_sc = NULL;
+
+ ssh_selinux_get_role_level(&role, &reqlvl);
#ifdef HAVE_GETSEUSERBYNAME
- if (getseuserbyname(pwname, &sename, &lvl) != 0)
- return NULL;
+ if ((r=getseuserbyname(pwname, &sename, &lvl)) != 0) {
+ sename = NULL;
+ lvl = NULL;
+ }
#else
sename = pwname;
- lvl = NULL;
+ lvl = "";
#endif
+ if (r == 0) {
#ifdef HAVE_GET_DEFAULT_CONTEXT_WITH_LEVEL
- r = get_default_context_with_level(sename, lvl, NULL, &sc);
+ r = get_default_context_with_level(sename, lvl, NULL, default_sc);
#else
- r = get_default_context(sename, NULL, &sc);
+ r = get_default_context(sename, NULL, default_sc);
#endif
+ }
- if (r != 0) {
- switch (security_getenforce()) {
- case -1:
- fatal("%s: ssh_selinux_getctxbyname: "
- "security_getenforce() failed", __func__);
- case 0:
- error("%s: Failed to get default SELinux security "
- "context for %s", __func__, pwname);
- break;
- default:
- fatal("%s: Failed to get default SELinux security "
- "context for %s (in enforcing mode)",
- __func__, pwname);
+ if (r == 0) {
+ /* If launched from xinetd, we must use current level */
+ if (inetd_flag && !rexeced_flag) {
+ security_context_t sshdsc=NULL;
+
+ if (getcon_raw(&sshdsc) < 0)
+ fatal("failed to allocate security context");
+
+ if ((con=context_new(sshdsc)) == NULL)
+ fatal("failed to allocate selinux context");
+ reqlvl = context_range_get(con);
+ freecon(sshdsc);
+ if (reqlvl !=NULL && lvl != NULL && strcmp(reqlvl, lvl) == 0)
+ /* we actually don't change level */
+ reqlvl = "";
+
+ debug("%s: current connection level '%s'", __func__, reqlvl);
}
+
+ if ((reqlvl != NULL && reqlvl[0]) || (role != NULL && role[0])) {
+ r = get_user_context(sename, role, reqlvl, user_sc);
+
+ if (r == 0 && reqlvl != NULL && reqlvl[0]) {
+ security_context_t default_level_sc = *default_sc;
+ if (role != NULL && role[0]) {
+ if (get_user_context(sename, role, lvl, &default_level_sc) < 0)
+ default_level_sc = *default_sc;
+ }
+ /* verify that the requested range is contained in the user range */
+ if (mls_range_allowed(default_level_sc, *user_sc)) {
+ logit("permit MLS level %s (user range %s)", reqlvl, lvl);
+ } else {
+ r = -1;
+ error("deny MLS level %s (user range %s)", reqlvl, lvl);
+ }
+ if (default_level_sc != *default_sc)
+ freecon(default_level_sc);
+ }
+ } else {
+ *user_sc = *default_sc;
+ }
+ }
+ if (r != 0) {
+ error("%s: Failed to get default SELinux security "
+ "context for %s", __func__, pwname);
}
#ifdef HAVE_GETSEUSERBYNAME
@@ -93,37 +314,114 @@ ssh_selinux_getctxbyname(char *pwname)
if (lvl != NULL)
xfree(lvl);
#endif
+ if (role != NULL)
+ xfree(role);
+ if (con)
+ context_free(con);
- return (sc);
+ return (r);
+}
+
+/* Setup environment variables for pam_selinux */
+static int
+ssh_selinux_setup_pam_variables(void)
+{
+ const char *reqlvl;
+ char *role;
+ char *use_current;
+ int rv;
+
+ debug3("%s: setting execution context", __func__);
+
+ ssh_selinux_get_role_level(&role, &reqlvl);
+
+ rv = do_pam_putenv("SELINUX_ROLE_REQUESTED", role ? role : "");
+
+ if (inetd_flag && !rexeced_flag) {
+ use_current = "1";
+ } else {
+ use_current = "";
+ rv = rv || do_pam_putenv("SELINUX_LEVEL_REQUESTED", reqlvl ? reqlvl: "");
+ }
+
+ rv = rv || do_pam_putenv("SELINUX_USE_CURRENT_RANGE", use_current);
+
+ if (role != NULL)
+ xfree(role);
+
+ return rv;
}
/* Set the execution context to the default for the specified user */
void
ssh_selinux_setup_exec_context(char *pwname)
{
+ int r = 0;
+ security_context_t default_ctx = NULL;
security_context_t user_ctx = NULL;
if (!ssh_selinux_enabled())
return;
+ if (options.use_pam) {
+ /* do not compute context, just setup environment for pam_selinux */
+ if (ssh_selinux_setup_pam_variables()) {
+ switch (security_getenforce()) {
+ case -1:
+ fatal("%s: security_getenforce() failed", __func__);
+ case 0:
+ error("%s: SELinux PAM variable setup failure. Continuing in permissive mode.",
+ __func__);
+ break;
+ default:
+ fatal("%s: SELinux PAM variable setup failure. Aborting connection.",
+ __func__);
+ }
+ }
+ return;
+ }
+
debug3("%s: setting execution context", __func__);
- user_ctx = ssh_selinux_getctxbyname(pwname);
- if (setexeccon(user_ctx) != 0) {
+ r = ssh_selinux_getctxbyname(pwname, &default_ctx, &user_ctx);
+ if (r >= 0) {
+ r = setexeccon(user_ctx);
+ if (r < 0) {
+ error("%s: Failed to set SELinux execution context %s for %s",
+ __func__, user_ctx, pwname);
+ }
+#ifdef HAVE_SETKEYCREATECON
+ else if (setkeycreatecon(user_ctx) < 0) {
+ error("%s: Failed to set SELinux keyring creation context %s for %s",
+ __func__, user_ctx, pwname);
+ }
+#endif
+ }
+ if (user_ctx == NULL) {
+ user_ctx = default_ctx;
+ }
+ if (r < 0 || user_ctx != default_ctx) {
+ /* audit just the case when user changed a role or there was
+ a failure */
+ send_audit_message(r >= 0, default_ctx, user_ctx);
+ }
+ if (r < 0) {
switch (security_getenforce()) {
case -1:
fatal("%s: security_getenforce() failed", __func__);
case 0:
- error("%s: Failed to set SELinux execution "
- "context for %s", __func__, pwname);
+ error("%s: SELinux failure. Continuing in permissive mode.",
+ __func__);
break;
default:
- fatal("%s: Failed to set SELinux execution context "
- "for %s (in enforcing mode)", __func__, pwname);
+ fatal("%s: SELinux failure. Aborting connection.",
+ __func__);
}
}
- if (user_ctx != NULL)
+ if (user_ctx != NULL && user_ctx != default_ctx)
freecon(user_ctx);
+ if (default_ctx != NULL)
+ freecon(default_ctx);
debug3("%s: done", __func__);
}
@@ -141,7 +439,10 @@ ssh_selinux_setup_pty(char *pwname, cons
debug3("%s: setting TTY context on %s", __func__, tty);
- user_ctx = ssh_selinux_getctxbyname(pwname);
+ if (getexeccon(&user_ctx) < 0) {
+ error("%s: getexeccon: %s", __func__, strerror(errno));
+ goto out;
+ }
/* XXX: should these calls fatal() upon failure in enforcing mode? */
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