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-rw-r--r--debian/patches/selinux-role.patch473
1 files changed, 473 insertions, 0 deletions
diff --git a/debian/patches/selinux-role.patch b/debian/patches/selinux-role.patch
new file mode 100644
index 000000000..1402b9025
--- /dev/null
+++ b/debian/patches/selinux-role.patch
@@ -0,0 +1,473 @@
1From 4b276122c04aed0726803a92c8ca955e614a4d3a Mon Sep 17 00:00:00 2001
2From: Manoj Srivastava <srivasta@debian.org>
3Date: Sun, 9 Feb 2014 16:09:49 +0000
4Subject: Handle SELinux authorisation roles
5
6Rejected upstream due to discomfort with magic usernames; a better approach
7will need an SSH protocol change. In the meantime, this came from Debian's
8SELinux maintainer, so we'll keep it until we have something better.
9
10Bug: https://bugzilla.mindrot.org/show_bug.cgi?id=1641
11Bug-Debian: http://bugs.debian.org/394795
12Last-Update: 2017-10-04
13
14Patch-Name: selinux-role.patch
15---
16 auth.h | 1 +
17 auth2.c | 10 ++++++++--
18 monitor.c | 32 +++++++++++++++++++++++++++++---
19 monitor.h | 2 ++
20 monitor_wrap.c | 22 ++++++++++++++++++++--
21 monitor_wrap.h | 3 ++-
22 openbsd-compat/port-linux.c | 27 ++++++++++++++++++++-------
23 openbsd-compat/port-linux.h | 4 ++--
24 platform.c | 4 ++--
25 platform.h | 2 +-
26 session.c | 10 +++++-----
27 session.h | 2 +-
28 sshd.c | 2 +-
29 sshpty.c | 4 ++--
30 sshpty.h | 2 +-
31 15 files changed, 97 insertions(+), 30 deletions(-)
32
33diff --git a/auth.h b/auth.h
34index 29835ae9..27a1a88e 100644
35--- a/auth.h
36+++ b/auth.h
37@@ -63,6 +63,7 @@ struct Authctxt {
38 char *service;
39 struct passwd *pw; /* set if 'valid' */
40 char *style;
41+ char *role;
42
43 /* Method lists for multiple authentication */
44 char **auth_methods; /* modified from server config */
45diff --git a/auth2.c b/auth2.c
46index 54070e3a..1f9ec632 100644
47--- a/auth2.c
48+++ b/auth2.c
49@@ -221,7 +221,7 @@ input_userauth_request(int type, u_int32_t seq, struct ssh *ssh)
50 {
51 Authctxt *authctxt = ssh->authctxt;
52 Authmethod *m = NULL;
53- char *user, *service, *method, *style = NULL;
54+ char *user, *service, *method, *style = NULL, *role = NULL;
55 int authenticated = 0;
56
57 if (authctxt == NULL)
58@@ -233,8 +233,13 @@ input_userauth_request(int type, u_int32_t seq, struct ssh *ssh)
59 debug("userauth-request for user %s service %s method %s", user, service, method);
60 debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
61
62+ if ((role = strchr(user, '/')) != NULL)
63+ *role++ = 0;
64+
65 if ((style = strchr(user, ':')) != NULL)
66 *style++ = 0;
67+ else if (role && (style = strchr(role, ':')) != NULL)
68+ *style++ = '\0';
69
70 if (authctxt->attempt++ == 0) {
71 /* setup auth context */
72@@ -261,8 +266,9 @@ input_userauth_request(int type, u_int32_t seq, struct ssh *ssh)
73 use_privsep ? " [net]" : "");
74 authctxt->service = xstrdup(service);
75 authctxt->style = style ? xstrdup(style) : NULL;
76+ authctxt->role = role ? xstrdup(role) : NULL;
77 if (use_privsep)
78- mm_inform_authserv(service, style);
79+ mm_inform_authserv(service, style, role);
80 userauth_banner();
81 if (auth2_setup_methods_lists(authctxt) != 0)
82 packet_disconnect("no authentication methods enabled");
83diff --git a/monitor.c b/monitor.c
84index cabfeb8a..510e3496 100644
85--- a/monitor.c
86+++ b/monitor.c
87@@ -127,6 +127,7 @@ int mm_answer_sign(int, Buffer *);
88 int mm_answer_pwnamallow(int, Buffer *);
89 int mm_answer_auth2_read_banner(int, Buffer *);
90 int mm_answer_authserv(int, Buffer *);
91+int mm_answer_authrole(int, Buffer *);
92 int mm_answer_authpassword(int, Buffer *);
93 int mm_answer_bsdauthquery(int, Buffer *);
94 int mm_answer_bsdauthrespond(int, Buffer *);
95@@ -204,6 +205,7 @@ struct mon_table mon_dispatch_proto20[] = {
96 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
97 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
98 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
99+ {MONITOR_REQ_AUTHROLE, MON_ONCE, mm_answer_authrole},
100 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
101 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
102 #ifdef USE_PAM
103@@ -799,6 +801,7 @@ mm_answer_pwnamallow(int sock, Buffer *m)
104
105 /* Allow service/style information on the auth context */
106 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
107+ monitor_permit(mon_dispatch, MONITOR_REQ_AUTHROLE, 1);
108 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
109
110 #ifdef USE_PAM
111@@ -829,14 +832,37 @@ mm_answer_authserv(int sock, Buffer *m)
112
113 authctxt->service = buffer_get_string(m, NULL);
114 authctxt->style = buffer_get_string(m, NULL);
115- debug3("%s: service=%s, style=%s",
116- __func__, authctxt->service, authctxt->style);
117+ authctxt->role = buffer_get_string(m, NULL);
118+ debug3("%s: service=%s, style=%s, role=%s",
119+ __func__, authctxt->service, authctxt->style, authctxt->role);
120
121 if (strlen(authctxt->style) == 0) {
122 free(authctxt->style);
123 authctxt->style = NULL;
124 }
125
126+ if (strlen(authctxt->role) == 0) {
127+ free(authctxt->role);
128+ authctxt->role = NULL;
129+ }
130+
131+ return (0);
132+}
133+
134+int
135+mm_answer_authrole(int sock, Buffer *m)
136+{
137+ monitor_permit_authentications(1);
138+
139+ authctxt->role = buffer_get_string(m, NULL);
140+ debug3("%s: role=%s",
141+ __func__, authctxt->role);
142+
143+ if (strlen(authctxt->role) == 0) {
144+ free(authctxt->role);
145+ authctxt->role = NULL;
146+ }
147+
148 return (0);
149 }
150
151@@ -1471,7 +1497,7 @@ mm_answer_pty(int sock, Buffer *m)
152 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
153 if (res == 0)
154 goto error;
155- pty_setowner(authctxt->pw, s->tty);
156+ pty_setowner(authctxt->pw, s->tty, authctxt->role);
157
158 buffer_put_int(m, 1);
159 buffer_put_cstring(m, s->tty);
160diff --git a/monitor.h b/monitor.h
161index ec41404c..4c7955d7 100644
162--- a/monitor.h
163+++ b/monitor.h
164@@ -68,6 +68,8 @@ enum monitor_reqtype {
165 MONITOR_REQ_GSSSIGN = 150, MONITOR_ANS_GSSSIGN = 151,
166 MONITOR_REQ_GSSUPCREDS = 152, MONITOR_ANS_GSSUPCREDS = 153,
167
168+ MONITOR_REQ_AUTHROLE = 154,
169+
170 };
171
172 struct monitor {
173diff --git a/monitor_wrap.c b/monitor_wrap.c
174index 0e171a6a..d806bb2e 100644
175--- a/monitor_wrap.c
176+++ b/monitor_wrap.c
177@@ -336,10 +336,10 @@ mm_auth2_read_banner(void)
178 return (banner);
179 }
180
181-/* Inform the privileged process about service and style */
182+/* Inform the privileged process about service, style, and role */
183
184 void
185-mm_inform_authserv(char *service, char *style)
186+mm_inform_authserv(char *service, char *style, char *role)
187 {
188 Buffer m;
189
190@@ -348,12 +348,30 @@ mm_inform_authserv(char *service, char *style)
191 buffer_init(&m);
192 buffer_put_cstring(&m, service);
193 buffer_put_cstring(&m, style ? style : "");
194+ buffer_put_cstring(&m, role ? role : "");
195
196 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
197
198 buffer_free(&m);
199 }
200
201+/* Inform the privileged process about role */
202+
203+void
204+mm_inform_authrole(char *role)
205+{
206+ Buffer m;
207+
208+ debug3("%s entering", __func__);
209+
210+ buffer_init(&m);
211+ buffer_put_cstring(&m, role ? role : "");
212+
213+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHROLE, &m);
214+
215+ buffer_free(&m);
216+}
217+
218 /* Do the password authentication */
219 int
220 mm_auth_password(Authctxt *authctxt, char *password)
221diff --git a/monitor_wrap.h b/monitor_wrap.h
222index 7b2e8945..a9ccb243 100644
223--- a/monitor_wrap.h
224+++ b/monitor_wrap.h
225@@ -41,7 +41,8 @@ int mm_is_monitor(void);
226 DH *mm_choose_dh(int, int, int);
227 int mm_key_sign(struct sshkey *, u_char **, u_int *, const u_char *, u_int,
228 const char *);
229-void mm_inform_authserv(char *, char *);
230+void mm_inform_authserv(char *, char *, char *);
231+void mm_inform_authrole(char *);
232 struct passwd *mm_getpwnamallow(const char *);
233 char *mm_auth2_read_banner(void);
234 int mm_auth_password(struct Authctxt *, char *);
235diff --git a/openbsd-compat/port-linux.c b/openbsd-compat/port-linux.c
236index e4c5d1b7..e26faf08 100644
237--- a/openbsd-compat/port-linux.c
238+++ b/openbsd-compat/port-linux.c
239@@ -27,6 +27,12 @@
240 #include <string.h>
241 #include <stdio.h>
242
243+#ifdef WITH_SELINUX
244+#include "key.h"
245+#include "hostfile.h"
246+#include "auth.h"
247+#endif
248+
249 #include "log.h"
250 #include "xmalloc.h"
251 #include "port-linux.h"
252@@ -56,7 +62,7 @@ ssh_selinux_enabled(void)
253
254 /* Return the default security context for the given username */
255 static security_context_t
256-ssh_selinux_getctxbyname(char *pwname)
257+ssh_selinux_getctxbyname(char *pwname, const char *role)
258 {
259 security_context_t sc = NULL;
260 char *sename = NULL, *lvl = NULL;
261@@ -71,9 +77,16 @@ ssh_selinux_getctxbyname(char *pwname)
262 #endif
263
264 #ifdef HAVE_GET_DEFAULT_CONTEXT_WITH_LEVEL
265- r = get_default_context_with_level(sename, lvl, NULL, &sc);
266+ if (role != NULL && role[0])
267+ r = get_default_context_with_rolelevel(sename, role, lvl, NULL,
268+ &sc);
269+ else
270+ r = get_default_context_with_level(sename, lvl, NULL, &sc);
271 #else
272- r = get_default_context(sename, NULL, &sc);
273+ if (role != NULL && role[0])
274+ r = get_default_context_with_role(sename, role, NULL, &sc);
275+ else
276+ r = get_default_context(sename, NULL, &sc);
277 #endif
278
279 if (r != 0) {
280@@ -103,7 +116,7 @@ ssh_selinux_getctxbyname(char *pwname)
281
282 /* Set the execution context to the default for the specified user */
283 void
284-ssh_selinux_setup_exec_context(char *pwname)
285+ssh_selinux_setup_exec_context(char *pwname, const char *role)
286 {
287 security_context_t user_ctx = NULL;
288
289@@ -112,7 +125,7 @@ ssh_selinux_setup_exec_context(char *pwname)
290
291 debug3("%s: setting execution context", __func__);
292
293- user_ctx = ssh_selinux_getctxbyname(pwname);
294+ user_ctx = ssh_selinux_getctxbyname(pwname, role);
295 if (setexeccon(user_ctx) != 0) {
296 switch (security_getenforce()) {
297 case -1:
298@@ -134,7 +147,7 @@ ssh_selinux_setup_exec_context(char *pwname)
299
300 /* Set the TTY context for the specified user */
301 void
302-ssh_selinux_setup_pty(char *pwname, const char *tty)
303+ssh_selinux_setup_pty(char *pwname, const char *tty, const char *role)
304 {
305 security_context_t new_tty_ctx = NULL;
306 security_context_t user_ctx = NULL;
307@@ -145,7 +158,7 @@ ssh_selinux_setup_pty(char *pwname, const char *tty)
308
309 debug3("%s: setting TTY context on %s", __func__, tty);
310
311- user_ctx = ssh_selinux_getctxbyname(pwname);
312+ user_ctx = ssh_selinux_getctxbyname(pwname, role);
313
314 /* XXX: should these calls fatal() upon failure in enforcing mode? */
315
316diff --git a/openbsd-compat/port-linux.h b/openbsd-compat/port-linux.h
317index 3c22a854..c8812942 100644
318--- a/openbsd-compat/port-linux.h
319+++ b/openbsd-compat/port-linux.h
320@@ -19,8 +19,8 @@
321
322 #ifdef WITH_SELINUX
323 int ssh_selinux_enabled(void);
324-void ssh_selinux_setup_pty(char *, const char *);
325-void ssh_selinux_setup_exec_context(char *);
326+void ssh_selinux_setup_pty(char *, const char *, const char *);
327+void ssh_selinux_setup_exec_context(char *, const char *);
328 void ssh_selinux_change_context(const char *);
329 void ssh_selinux_setfscreatecon(const char *);
330 #endif
331diff --git a/platform.c b/platform.c
332index 18c7751d..380ee3a4 100644
333--- a/platform.c
334+++ b/platform.c
335@@ -143,7 +143,7 @@ platform_setusercontext(struct passwd *pw)
336 * called if sshd is running as root.
337 */
338 void
339-platform_setusercontext_post_groups(struct passwd *pw)
340+platform_setusercontext_post_groups(struct passwd *pw, const char *role)
341 {
342 #if !defined(HAVE_LOGIN_CAP) && defined(USE_PAM)
343 /*
344@@ -184,7 +184,7 @@ platform_setusercontext_post_groups(struct passwd *pw)
345 }
346 #endif /* HAVE_SETPCRED */
347 #ifdef WITH_SELINUX
348- ssh_selinux_setup_exec_context(pw->pw_name);
349+ ssh_selinux_setup_exec_context(pw->pw_name, role);
350 #endif
351 }
352
353diff --git a/platform.h b/platform.h
354index ea4f9c58..60d72ffe 100644
355--- a/platform.h
356+++ b/platform.h
357@@ -25,7 +25,7 @@ void platform_post_fork_parent(pid_t child_pid);
358 void platform_post_fork_child(void);
359 int platform_privileged_uidswap(void);
360 void platform_setusercontext(struct passwd *);
361-void platform_setusercontext_post_groups(struct passwd *);
362+void platform_setusercontext_post_groups(struct passwd *, const char *);
363 char *platform_get_krb5_client(const char *);
364 char *platform_krb5_get_principal_name(const char *);
365 int platform_sys_dir_uid(uid_t);
366diff --git a/session.c b/session.c
367index 4bccb62d..d40afe4f 100644
368--- a/session.c
369+++ b/session.c
370@@ -1312,7 +1312,7 @@ safely_chroot(const char *path, uid_t uid)
371
372 /* Set login name, uid, gid, and groups. */
373 void
374-do_setusercontext(struct passwd *pw)
375+do_setusercontext(struct passwd *pw, const char *role)
376 {
377 char *chroot_path, *tmp;
378
379@@ -1340,7 +1340,7 @@ do_setusercontext(struct passwd *pw)
380 endgrent();
381 #endif
382
383- platform_setusercontext_post_groups(pw);
384+ platform_setusercontext_post_groups(pw, role);
385
386 if (!in_chroot && options.chroot_directory != NULL &&
387 strcasecmp(options.chroot_directory, "none") != 0) {
388@@ -1477,7 +1477,7 @@ do_child(struct ssh *ssh, Session *s, const char *command)
389
390 /* Force a password change */
391 if (s->authctxt->force_pwchange) {
392- do_setusercontext(pw);
393+ do_setusercontext(pw, s->authctxt->role);
394 child_close_fds(ssh);
395 do_pwchange(s);
396 exit(1);
397@@ -1499,7 +1499,7 @@ do_child(struct ssh *ssh, Session *s, const char *command)
398 /* When PAM is enabled we rely on it to do the nologin check */
399 if (!options.use_pam)
400 do_nologin(pw);
401- do_setusercontext(pw);
402+ do_setusercontext(pw, s->authctxt->role);
403 /*
404 * PAM session modules in do_setusercontext may have
405 * generated messages, so if this in an interactive
406@@ -1891,7 +1891,7 @@ session_pty_req(struct ssh *ssh, Session *s)
407 tty_parse_modes(s->ttyfd, &n_bytes);
408
409 if (!use_privsep)
410- pty_setowner(s->pw, s->tty);
411+ pty_setowner(s->pw, s->tty, s->authctxt->role);
412
413 /* Set window size from the packet. */
414 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
415diff --git a/session.h b/session.h
416index 54dd1f0c..8535ebce 100644
417--- a/session.h
418+++ b/session.h
419@@ -76,7 +76,7 @@ void session_pty_cleanup2(Session *);
420 Session *session_new(void);
421 Session *session_by_tty(char *);
422 void session_close(struct ssh *, Session *);
423-void do_setusercontext(struct passwd *);
424+void do_setusercontext(struct passwd *, const char *);
425
426 const char *session_get_remote_name_or_ip(struct ssh *, u_int, int);
427
428diff --git a/sshd.c b/sshd.c
429index a66e9ca6..af1ec337 100644
430--- a/sshd.c
431+++ b/sshd.c
432@@ -677,7 +677,7 @@ privsep_postauth(Authctxt *authctxt)
433 reseed_prngs();
434
435 /* Drop privileges */
436- do_setusercontext(authctxt->pw);
437+ do_setusercontext(authctxt->pw, authctxt->role);
438
439 skip:
440 /* It is safe now to apply the key state */
441diff --git a/sshpty.c b/sshpty.c
442index fe2fb5aa..feb22b06 100644
443--- a/sshpty.c
444+++ b/sshpty.c
445@@ -187,7 +187,7 @@ pty_change_window_size(int ptyfd, u_int row, u_int col,
446 }
447
448 void
449-pty_setowner(struct passwd *pw, const char *tty)
450+pty_setowner(struct passwd *pw, const char *tty, const char *role)
451 {
452 struct group *grp;
453 gid_t gid;
454@@ -209,7 +209,7 @@ pty_setowner(struct passwd *pw, const char *tty)
455 strerror(errno));
456
457 #ifdef WITH_SELINUX
458- ssh_selinux_setup_pty(pw->pw_name, tty);
459+ ssh_selinux_setup_pty(pw->pw_name, tty, role);
460 #endif
461
462 if (st.st_uid != pw->pw_uid || st.st_gid != gid) {
463diff --git a/sshpty.h b/sshpty.h
464index 9ec7e9a1..de7e000a 100644
465--- a/sshpty.h
466+++ b/sshpty.h
467@@ -24,5 +24,5 @@ int pty_allocate(int *, int *, char *, size_t);
468 void pty_release(const char *);
469 void pty_make_controlling_tty(int *, const char *);
470 void pty_change_window_size(int, u_int, u_int, u_int, u_int);
471-void pty_setowner(struct passwd *, const char *);
472+void pty_setowner(struct passwd *, const char *, const char *);
473 void disconnect_controlling_tty(void);
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