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-rw-r--r--backport-openssh-7.8p1-role-mls.patch885
1 files changed, 885 insertions, 0 deletions
diff --git a/backport-openssh-7.8p1-role-mls.patch b/backport-openssh-7.8p1-role-mls.patch
new file mode 100644
index 0000000..db189eb
--- /dev/null
+++ b/backport-openssh-7.8p1-role-mls.patch
@@ -0,0 +1,885 @@
+diff -up openssh/auth2.c.role-mls openssh/auth2.c
+--- openssh/auth2.c.role-mls 2018-08-20 07:57:29.000000000 +0200
++++ openssh/auth2.c 2018-08-22 11:14:56.815430916 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -256,6 +256,9 @@ input_userauth_request(int type, u_int32
+ Authctxt *authctxt = ssh->authctxt;
+ Authmethod *m = NULL;
+ char *user = NULL, *service = NULL, *method = NULL, *style = NULL;
++#ifdef WITH_SELINUX
++ char *role = NULL;
++#endif
+ int r, authenticated = 0;
+ double tstart = monotime_double();
+
+@@ -268,6 +271,11 @@ 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);
+
++#ifdef WITH_SELINUX
++ if ((role = strchr(user, '/')) != NULL)
++ *role++ = 0;
++#endif
++
+ if ((style = strchr(user, ':')) != NULL)
+ *style++ = 0;
+
+@@ -296,8 +304,15 @@ input_userauth_request(int type, u_int32
+ use_privsep ? " [net]" : "");
+ authctxt->service = xstrdup(service);
+ authctxt->style = style ? xstrdup(style) : NULL;
+- if (use_privsep)
++#ifdef WITH_SELINUX
++ authctxt->role = role ? xstrdup(role) : NULL;
++#endif
++ if (use_privsep) {
+ mm_inform_authserv(service, style);
++#ifdef WITH_SELINUX
++ mm_inform_authrole(role);
++#endif
++ }
+ userauth_banner(ssh);
+ if (auth2_setup_methods_lists(authctxt) != 0)
+ ssh_packet_disconnect(ssh,
+diff -up openssh/auth2-gss.c.role-mls openssh/auth2-gss.c
+--- openssh/auth2-gss.c.role-mls 2018-08-20 07:57:29.000000000 +0200
++++ openssh/auth2-gss.c 2018-08-22 11:15:42.459799171 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -281,6 +281,7 @@ input_gssapi_mic(int type, u_int32_t ple
+ Authctxt *authctxt = ssh->authctxt;
+ Gssctxt *gssctxt;
+ int r, authenticated = 0;
++ char *micuser;
+ struct sshbuf *b;
+ gss_buffer_desc mic, gssbuf;
+ const char *displayname;
+@@ -298,7 +299,13 @@ input_gssapi_mic(int type, u_int32_t ple
+ fatal_f("sshbuf_new failed");
+ mic.value = p;
+ mic.length = len;
+- ssh_gssapi_buildmic(b, authctxt->user, authctxt->service,
++#ifdef WITH_SELINUX
++ if (authctxt->role && authctxt->role[0] != 0)
++ xasprintf(&micuser, "%s/%s", authctxt->user, authctxt->role);
++ else
++#endif
++ micuser = authctxt->user;
++ ssh_gssapi_buildmic(b, micuser, authctxt->service,
+ "gssapi-with-mic", ssh->kex->session_id);
+
+ if ((gssbuf.value = sshbuf_mutable_ptr(b)) == NULL)
+@@ -311,6 +318,8 @@ input_gssapi_mic(int type, u_int32_t ple
+ logit("GSSAPI MIC check failed");
+
+ sshbuf_free(b);
++ if (micuser != authctxt->user)
++ free(micuser);
+ free(mic.value);
+
+ if ((!use_privsep || mm_is_monitor()) &&
+diff -up openssh/auth2-hostbased.c.role-mls openssh/auth2-hostbased.c
+--- openssh/auth2-hostbased.c.role-mls 2018-08-20 07:57:29.000000000 +0200
++++ openssh/auth2-hostbased.c 2018-08-22 11:14:56.816430924 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -123,7 +123,16 @@ userauth_hostbased(struct ssh *ssh)
+ /* reconstruct packet */
+ if ((r = sshbuf_put_stringb(b, ssh->kex->session_id)) != 0 ||
+ (r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
++#ifdef WITH_SELINUX
++ (authctxt->role
++ ? ( (r = sshbuf_put_u32(b, strlen(authctxt->user)+strlen(authctxt->role)+1)) != 0 ||
++ (r = sshbuf_put(b, authctxt->user, strlen(authctxt->user))) != 0 ||
++ (r = sshbuf_put_u8(b, '/') != 0) ||
++ (r = sshbuf_put(b, authctxt->role, strlen(authctxt->role))) != 0)
++ : (r = sshbuf_put_cstring(b, authctxt->user)) != 0) ||
++#else
+ (r = sshbuf_put_cstring(b, authctxt->user)) != 0 ||
++#endif
+ (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||
+ (r = sshbuf_put_cstring(b, "hostbased")) != 0 ||
+ (r = sshbuf_put_string(b, pkalg, alen)) != 0 ||
+diff -up openssh/auth2-pubkey.c.role-mls openssh/auth2-pubkey.c
+--- openssh/auth2-pubkey.c.role-mls 2018-08-22 11:14:56.816430924 +0200
++++ openssh/auth2-pubkey.c 2018-08-22 11:17:07.331483958 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -169,9 +169,16 @@ userauth_pubkey(struct ssh *ssh)
+ goto done;
+ }
+ /* reconstruct packet */
+- xasprintf(&userstyle, "%s%s%s", authctxt->user,
++ xasprintf(&userstyle, "%s%s%s%s%s", authctxt->user,
+ authctxt->style ? ":" : "",
+- authctxt->style ? authctxt->style : "");
++ authctxt->style ? authctxt->style : "",
++#ifdef WITH_SELINUX
++ authctxt->role ? "/" : "",
++ authctxt->role ? authctxt->role : ""
++#else
++ "", ""
++#endif
++ );
+ if ((r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
+ (r = sshbuf_put_cstring(b, userstyle)) != 0 ||
+ (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||
+diff -up openssh/auth.h.role-mls openssh/auth.h
+--- openssh/auth.h.role-mls 2018-08-20 07:57:29.000000000 +0200
++++ openssh/auth.h 2018-08-22 11:14:56.816430924 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -65,6 +65,9 @@ struct Authctxt {
+ char *service;
+ struct passwd *pw; /* set if 'valid' */
+ char *style;
++#ifdef WITH_SELINUX
++ char *role;
++#endif
+
+ /* Method lists for multiple authentication */
+ char **auth_methods; /* modified from server config */
+diff -up openssh/auth-pam.c.role-mls openssh/auth-pam.c
+--- openssh/auth-pam.c.role-mls 2018-08-20 07:57:29.000000000 +0200
++++ openssh/auth-pam.c 2018-08-22 11:14:56.816430924 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -1172,7 +1172,7 @@ is_pam_session_open(void)
+ * during the ssh authentication process.
+ */
+ int
+-do_pam_putenv(char *name, char *value)
++do_pam_putenv(char *name, const char *value)
+ {
+ int ret = 1;
+ char *compound;
+diff -up openssh/auth-pam.h.role-mls openssh/auth-pam.h
+--- openssh/auth-pam.h.role-mls 2018-08-20 07:57:29.000000000 +0200
++++ openssh/auth-pam.h 2018-08-22 11:14:56.817430932 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -33,7 +33,7 @@ u_int do_pam_account(void);
+ void do_pam_session(struct ssh *);
+ void do_pam_setcred(int );
+ void do_pam_chauthtok(void);
+-int do_pam_putenv(char *, char *);
++int do_pam_putenv(char *, const char *);
+ char ** fetch_pam_environment(void);
+ char ** fetch_pam_child_environment(void);
+ void free_pam_environment(char **);
+diff -up openssh/misc.c.role-mls openssh/misc.c
+--- openssh/misc.c.role-mls 2018-08-20 07:57:29.000000000 +0200
++++ openssh/misc.c 2018-08-22 11:14:56.817430932 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -542,6 +542,7 @@ char *
+ colon(char *cp)
+ {
+ int flag = 0;
++ int start = 1;
+
+ if (*cp == ':') /* Leading colon is part of file name. */
+ return NULL;
+@@ -557,6 +558,13 @@ colon(char *cp)
+ return (cp);
+ if (*cp == '/')
+ return NULL;
++ if (start) {
++ /* Slash on beginning or after dots only denotes file name. */
++ if (*cp == '/')
++ return (0);
++ if (*cp != '.')
++ start = 0;
++ }
+ }
+ return NULL;
+ }
+diff -up openssh-8.6p1/monitor.c.role-mls openssh-8.6p1/monitor.c
+--- openssh-8.6p1/monitor.c.role-mls 2021-04-16 05:55:25.000000000 +0200
++++ openssh-8.6p1/monitor.c 2021-05-21 14:21:56.719414087 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -117,6 +117,9 @@ int mm_answer_sign(struct ssh *, int, st
+ int mm_answer_pwnamallow(struct ssh *, int, struct sshbuf *);
+ int mm_answer_auth2_read_banner(struct ssh *, int, struct sshbuf *);
+ int mm_answer_authserv(struct ssh *, int, struct sshbuf *);
++#ifdef WITH_SELINUX
++int mm_answer_authrole(struct ssh *, int, struct sshbuf *);
++#endif
+ int mm_answer_authpassword(struct ssh *, int, struct sshbuf *);
+ int mm_answer_bsdauthquery(struct ssh *, int, struct sshbuf *);
+ int mm_answer_bsdauthrespond(struct ssh *, int, struct sshbuf *);
+@@ -195,6 +198,9 @@ 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},
++#ifdef WITH_SELINUX
++ {MONITOR_REQ_AUTHROLE, MON_ONCE, mm_answer_authrole},
++#endif
+ {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
+ {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
+ #ifdef USE_PAM
+@@ -803,6 +809,9 @@ mm_answer_pwnamallow(struct ssh *ssh, in
+
+ /* Allow service/style information on the auth context */
+ monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
++#ifdef WITH_SELINUX
++ monitor_permit(mon_dispatch, MONITOR_REQ_AUTHROLE, 1);
++#endif
+ monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
+
+ #ifdef USE_PAM
+@@ -877,6 +886,26 @@ key_base_type_match(const char *method,
+ return found;
+ }
+
++#ifdef WITH_SELINUX
++int
++mm_answer_authrole(struct ssh *ssh, int sock, struct sshbuf *m)
++{
++ int r;
++ monitor_permit_authentications(1);
++
++ if ((r = sshbuf_get_cstring(m, &authctxt->role, NULL)) != 0)
++ fatal_f("buffer error: %s", ssh_err(r));
++ debug3_f("role=%s", authctxt->role);
++
++ if (strlen(authctxt->role) == 0) {
++ free(authctxt->role);
++ authctxt->role = NULL;
++ }
++
++ return (0);
++}
++#endif
++
+ int
+ mm_answer_authpassword(struct ssh *ssh, int sock, struct sshbuf *m)
+ {
+@@ -1251,7 +1280,7 @@ monitor_valid_userblob(struct ssh *ssh,
+ {
+ struct sshbuf *b;
+ const u_char *p;
+- char *userstyle, *cp;
++ char *userstyle, *s, *cp;
+ size_t len;
+ u_char type;
+ int r, fail = 0;
+@@ -1282,6 +1311,8 @@ monitor_valid_userblob(struct ssh *ssh,
+ fail++;
+ if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
+ fatal_fr(r, "parse userstyle");
++ if ((s = strchr(cp, '/')) != NULL)
++ *s = '\0';
+ xasprintf(&userstyle, "%s%s%s", authctxt->user,
+ authctxt->style ? ":" : "",
+ authctxt->style ? authctxt->style : "");
+@@ -1317,7 +1348,7 @@ monitor_valid_hostbasedblob(const u_char
+ {
+ struct sshbuf *b;
+ const u_char *p;
+- char *cp, *userstyle;
++ char *cp, *s, *userstyle;
+ size_t len;
+ int r, fail = 0;
+ u_char type;
+@@ -1338,6 +1370,8 @@ monitor_valid_hostbasedblob(const u_char
+ fail++;
+ if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)
+ fatal_fr(r, "parse userstyle");
++ if ((s = strchr(cp, '/')) != NULL)
++ *s = '\0';
+ xasprintf(&userstyle, "%s%s%s", authctxt->user,
+ authctxt->style ? ":" : "",
+ authctxt->style ? authctxt->style : "");
+diff -up openssh/monitor.h.role-mls openssh/monitor.h
+--- openssh/monitor.h.role-mls 2018-08-20 07:57:29.000000000 +0200
++++ openssh/monitor.h 2018-08-22 11:14:56.818430941 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -55,6 +55,10 @@ enum monitor_reqtype {
+ MONITOR_REQ_GSSCHECKMIC = 48, MONITOR_ANS_GSSCHECKMIC = 49,
+ MONITOR_REQ_TERM = 50,
+
++#ifdef WITH_SELINUX
++ MONITOR_REQ_AUTHROLE = 80,
++#endif
++
+ MONITOR_REQ_PAM_START = 100,
+ MONITOR_REQ_PAM_ACCOUNT = 102, MONITOR_ANS_PAM_ACCOUNT = 103,
+ MONITOR_REQ_PAM_INIT_CTX = 104, MONITOR_ANS_PAM_INIT_CTX = 105,
+diff -up openssh/monitor_wrap.c.role-mls openssh/monitor_wrap.c
+--- openssh/monitor_wrap.c.role-mls 2018-08-22 11:14:56.818430941 +0200
++++ openssh/monitor_wrap.c 2018-08-22 11:21:47.938747968 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -390,6 +390,27 @@ mm_inform_authserv(char *service, char *
+ sshbuf_free(m);
+ }
+
++/* Inform the privileged process about role */
++
++#ifdef WITH_SELINUX
++void
++mm_inform_authrole(char *role)
++{
++ int r;
++ struct sshbuf *m;
++
++ debug3_f("entering");
++
++ if ((m = sshbuf_new()) == NULL)
++ fatal_f("sshbuf_new failed");
++ if ((r = sshbuf_put_cstring(m, role ? role : "")) != 0)
++ fatal_f("buffer error: %s", ssh_err(r));
++ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHROLE, m);
++
++ sshbuf_free(m);
++}
++#endif
++
+ /* Do the password authentication */
+ int
+ mm_auth_password(struct ssh *ssh, char *password)
+diff -up openssh/monitor_wrap.h.role-mls openssh/monitor_wrap.h
+--- openssh/monitor_wrap.h.role-mls 2018-08-22 11:14:56.818430941 +0200
++++ openssh/monitor_wrap.h 2018-08-22 11:22:10.439929513 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -44,6 +44,9 @@ DH *mm_choose_dh(int, int, int);
+ const u_char *, size_t, const char *, const char *,
+ const char *, u_int compat);
+ void mm_inform_authserv(char *, char *);
++#ifdef WITH_SELINUX
++void mm_inform_authrole(char *);
++#endif
+ struct passwd *mm_getpwnamallow(struct ssh *, const char *);
+ char *mm_auth2_read_banner(void);
+ int mm_auth_password(struct ssh *, char *);
+diff -up openssh/openbsd-compat/Makefile.in.role-mls openssh/openbsd-compat/Makefile.in
+--- openssh/openbsd-compat/Makefile.in.role-mls 2018-08-20 07:57:29.000000000 +0200
++++ openssh/openbsd-compat/Makefile.in 2018-08-22 11:14:56.819430949 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -92,7 +92,8 @@ PORTS= port-aix.o \
+ port-prngd.o \
+ port-solaris.o \
+ port-net.o \
+- port-uw.o
++ port-uw.o \
++ port-linux-sshd.o
+
+ .c.o:
+ $(CC) $(CFLAGS_NOPIE) $(PICFLAG) $(CPPFLAGS) -c $<
+diff -up openssh/openbsd-compat/port-linux.c.role-mls openssh/openbsd-compat/port-linux.c
+--- openssh/openbsd-compat/port-linux.c.role-mls 2018-08-20 07:57:29.000000000 +0200
++++ openssh/openbsd-compat/port-linux.c 2018-08-22 11:14:56.819430949 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -100,37 +100,6 @@ ssh_selinux_getctxbyname(char *pwname)
+ return sc;
+ }
+
+-/* Set the execution context to the default for the specified user */
+-void
+-ssh_selinux_setup_exec_context(char *pwname)
+-{
+- char *user_ctx = NULL;
+-
+- if (!ssh_selinux_enabled())
+- return;
+-
+- debug3("%s: setting execution context", __func__);
+-
+- user_ctx = ssh_selinux_getctxbyname(pwname);
+- if (setexeccon(user_ctx) != 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);
+- break;
+- default:
+- fatal("%s: Failed to set SELinux execution context "
+- "for %s (in enforcing mode)", __func__, pwname);
+- }
+- }
+- if (user_ctx != NULL)
+- freecon(user_ctx);
+-
+- debug3("%s: done", __func__);
+-}
+-
+ /* Set the TTY context for the specified user */
+ void
+ ssh_selinux_setup_pty(char *pwname, const char *tty)
+@@ -145,7 +114,11 @@ 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_f("getexeccon: %s", strerror(errno));
++ goto out;
++ }
++
+
+ /* XXX: should these calls fatal() upon failure in enforcing mode? */
+
+diff -up openssh/openbsd-compat/port-linux.h.role-mls openssh/openbsd-compat/port-linux.h
+--- openssh/openbsd-compat/port-linux.h.role-mls 2018-08-20 07:57:29.000000000 +0200
++++ openssh/openbsd-compat/port-linux.h 2018-08-22 11:14:56.819430949 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -20,9 +20,10 @@
+ #ifdef WITH_SELINUX
+ int ssh_selinux_enabled(void);
+ void ssh_selinux_setup_pty(char *, const char *);
+-void ssh_selinux_setup_exec_context(char *);
+ void ssh_selinux_change_context(const char *);
+ void ssh_selinux_setfscreatecon(const char *);
++
++void sshd_selinux_setup_exec_context(char *);
+ #endif
+
+ #ifdef LINUX_OOM_ADJUST
+diff -up openssh/openbsd-compat/port-linux-sshd.c.role-mls openssh/openbsd-compat/port-linux-sshd.c
+--- openssh/openbsd-compat/port-linux-sshd.c.role-mls 2018-08-22 11:14:56.819430949 +0200
++++ openssh/openbsd-compat/port-linux-sshd.c 2018-08-22 11:14:56.819430949 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -0,0 +1,421 @@
++/*
++ * Copyright (c) 2005 Daniel Walsh <dwalsh@redhat.com>
++ * Copyright (c) 2014 Petr Lautrbach <plautrba@redhat.com>
++ *
++ * Permission to use, copy, modify, and distribute this software for any
++ * purpose with or without fee is hereby granted, provided that the above
++ * copyright notice and this permission notice appear in all copies.
++ *
++ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
++ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
++ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
++ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
++ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
++ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
++ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
++ */
++
++/*
++ * Linux-specific portability code - just SELinux support for sshd at present
++ */
++
++#include "includes.h"
++
++#if defined(WITH_SELINUX) || defined(LINUX_OOM_ADJUST)
++#include <errno.h>
++#include <stdarg.h>
++#include <string.h>
++#include <stdio.h>
++#include <stdlib.h>
++
++#include "log.h"
++#include "xmalloc.h"
++#include "misc.h" /* servconf.h needs misc.h for struct ForwardOptions */
++#include "servconf.h"
++#include "port-linux.h"
++#include "sshkey.h"
++#include "hostfile.h"
++#include "auth.h"
++
++#ifdef WITH_SELINUX
++#include <selinux/selinux.h>
++#include <selinux/context.h>
++#include <selinux/get_context_list.h>
++#include <selinux/get_default_type.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;
++
++/* Send audit message */
++static int
++sshd_selinux_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;
++ access_vector_t bit;
++ security_class_t class;
++
++ debug_f("src:%s dst:%s", src, dst);
++ class = string_to_security_class("context");
++ if (!class) {
++ error("string_to_security_class failed to translate security class context");
++ return 1;
++ }
++ bit = string_to_av_perm(class, "contains");
++ if (!bit) {
++ error("string_to_av_perm failed to translate av perm contains");
++ return 1;
++ }
++ retval = security_compute_av(src, dst, class, 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 int
++sshd_selinux_getctxbyname(char *pwname,
++ security_context_t *default_sc, security_context_t *user_sc)
++{
++ char *sename, *lvl;
++ char *role;
++ const char *reqlvl;
++ int r = 0;
++ context_t con = NULL;
++
++ ssh_selinux_get_role_level(&role, &reqlvl);
++
++#ifdef HAVE_GETSEUSERBYNAME
++ if ((r=getseuserbyname(pwname, &sename, &lvl)) != 0) {
++ sename = NULL;
++ lvl = NULL;
++ }
++#else
++ sename = pwname;
++ lvl = "";
++#endif
++
++ if (r == 0) {
++#ifdef HAVE_GET_DEFAULT_CONTEXT_WITH_LEVEL
++ r = get_default_context_with_level(sename, lvl, NULL, default_sc);
++#else
++ r = get_default_context(sename, NULL, default_sc);
++#endif
++ }
++
++ 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_f("current connection level '%s'", 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_f("Failed to get default SELinux security "
++ "context for %s", pwname);
++ }
++
++#ifdef HAVE_GETSEUSERBYNAME
++ free(sename);
++ free(lvl);
++#endif
++
++ if (role != NULL)
++ free(role);
++ if (con)
++ context_free(con);
++
++ return (r);
++}
++
++/* Setup environment variables for pam_selinux */
++static int
++sshd_selinux_setup_pam_variables(void)
++{
++ const char *reqlvl;
++ char *role;
++ char *use_current;
++ int rv;
++
++ debug3_f("setting execution context");
++
++ 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)
++ free(role);
++
++ return rv;
++}
++
++/* Set the execution context to the default for the specified user */
++void
++sshd_selinux_setup_exec_context(char *pwname)
++{
++ security_context_t user_ctx = NULL;
++ int r = 0;
++ security_context_t default_ctx = NULL;
++
++ if (!ssh_selinux_enabled())
++ return;
++
++ if (options.use_pam) {
++ /* do not compute context, just setup environment for pam_selinux */
++ if (sshd_selinux_setup_pam_variables()) {
++ switch (security_getenforce()) {
++ case -1:
++ fatal_f("security_getenforce() failed");
++ case 0:
++ error_f("SELinux PAM variable setup failure. Continuing in permissive mode.");
++ break;
++ default:
++ fatal_f("SELinux PAM variable setup failure. Aborting connection.");
++ }
++ }
++ return;
++ }
++
++ debug3_f("setting execution context");
++
++ r = sshd_selinux_getctxbyname(pwname, &default_ctx, &user_ctx);
++ if (r >= 0) {
++ r = setexeccon(user_ctx);
++ if (r < 0) {
++ error_f("Failed to set SELinux execution context %s for %s",
++ user_ctx, pwname);
++ }
++#ifdef HAVE_SETKEYCREATECON
++ else if (setkeycreatecon(user_ctx) < 0) {
++ error_f("Failed to set SELinux keyring creation context %s for %s",
++ 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 */
++ sshd_selinux_send_audit_message(r >= 0, default_ctx, user_ctx);
++ }
++ if (r < 0) {
++ switch (security_getenforce()) {
++ case -1:
++ fatal_f("security_getenforce() failed");
++ case 0:
++ error_f("ELinux failure. Continuing in permissive mode.");
++ break;
++ default:
++ fatal_f("SELinux failure. Aborting connection.");
++ }
++ }
++ if (user_ctx != NULL && user_ctx != default_ctx)
++ freecon(user_ctx);
++ if (default_ctx != NULL)
++ freecon(default_ctx);
++
++ debug3_f("done");
++}
++
++#endif
++#endif
++
+diff -up openssh/platform.c.role-mls openssh/platform.c
+--- openssh/platform.c.role-mls 2018-08-20 07:57:29.000000000 +0200
++++ openssh/platform.c 2018-08-22 11:14:56.819430949 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -183,7 +183,7 @@ platform_setusercontext_post_groups(stru
+ }
+ #endif /* HAVE_SETPCRED */
+ #ifdef WITH_SELINUX
+- ssh_selinux_setup_exec_context(pw->pw_name);
++ sshd_selinux_setup_exec_context(pw->pw_name);
+ #endif
+ }
+
+diff -up openssh/sshd.c.role-mls openssh/sshd.c
+--- openssh/sshd.c.role-mls 2018-08-20 07:57:29.000000000 +0200
++++ openssh/sshd.c 2018-08-22 11:14:56.820430957 +0200
+Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.8p1-role-mls.patch
+@@ -2186,6 +2186,9 @@ main(int ac, char **av)
+ restore_uid();
+ }
+ #endif
++#ifdef WITH_SELINUX
++ sshd_selinux_setup_exec_context(authctxt->pw->pw_name);
++#endif
+ #ifdef USE_PAM
+ if (options.use_pam) {
+ do_pam_setcred(1);
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-30 15:14:19 +0000