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-rw-r--r--debian/patches/selinux-role.patch504
1 files changed, 504 insertions, 0 deletions
diff --git a/debian/patches/selinux-role.patch b/debian/patches/selinux-role.patch
new file mode 100644
index 000000000..aee443d87
--- /dev/null
+++ b/debian/patches/selinux-role.patch
@@ -0,0 +1,504 @@
1From d55bc528ac450324522f02d90a2bdc4832d1eef8 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: 2015-08-19
13
14Patch-Name: selinux-role.patch
15---
16 auth.h | 1 +
17 auth1.c | 8 +++++++-
18 auth2.c | 10 ++++++++--
19 monitor.c | 32 +++++++++++++++++++++++++++++---
20 monitor.h | 2 ++
21 monitor_wrap.c | 22 ++++++++++++++++++++--
22 monitor_wrap.h | 3 ++-
23 openbsd-compat/port-linux.c | 27 ++++++++++++++++++++-------
24 openbsd-compat/port-linux.h | 4 ++--
25 platform.c | 4 ++--
26 platform.h | 2 +-
27 session.c | 10 +++++-----
28 session.h | 2 +-
29 sshd.c | 2 +-
30 sshpty.c | 4 ++--
31 sshpty.h | 2 +-
32 16 files changed, 104 insertions(+), 31 deletions(-)
33
34diff --git a/auth.h b/auth.h
35index 8b27575..3c2222f 100644
36--- a/auth.h
37+++ b/auth.h
38@@ -62,6 +62,7 @@ struct Authctxt {
39 char *service;
40 struct passwd *pw; /* set if 'valid' */
41 char *style;
42+ char *role;
43 void *kbdintctxt;
44 char *info; /* Extra info for next auth_log */
45 #ifdef BSD_AUTH
46diff --git a/auth1.c b/auth1.c
47index 5073c49..dd00648 100644
48--- a/auth1.c
49+++ b/auth1.c
50@@ -383,7 +383,7 @@ void
51 do_authentication(Authctxt *authctxt)
52 {
53 u_int ulen;
54- char *user, *style = NULL;
55+ char *user, *style = NULL, *role = NULL;
56
57 /* Get the name of the user that we wish to log in as. */
58 packet_read_expect(SSH_CMSG_USER);
59@@ -392,11 +392,17 @@ do_authentication(Authctxt *authctxt)
60 user = packet_get_cstring(&ulen);
61 packet_check_eom();
62
63+ if ((role = strchr(user, '/')) != NULL)
64+ *role++ = '\0';
65+
66 if ((style = strchr(user, ':')) != NULL)
67 *style++ = '\0';
68+ else if (role && (style = strchr(role, ':')) != NULL)
69+ *style++ = '\0';
70
71 authctxt->user = user;
72 authctxt->style = style;
73+ authctxt->role = role;
74
75 /* Verify that the user is a valid user. */
76 if ((authctxt->pw = PRIVSEP(getpwnamallow(user))) != NULL)
77diff --git a/auth2.c b/auth2.c
78index 3f49bdc..6eb3cc7 100644
79--- a/auth2.c
80+++ b/auth2.c
81@@ -216,7 +216,7 @@ input_userauth_request(int type, u_int32_t seq, void *ctxt)
82 {
83 Authctxt *authctxt = ctxt;
84 Authmethod *m = NULL;
85- char *user, *service, *method, *style = NULL;
86+ char *user, *service, *method, *style = NULL, *role = NULL;
87 int authenticated = 0;
88
89 if (authctxt == NULL)
90@@ -228,8 +228,13 @@ input_userauth_request(int type, u_int32_t seq, void *ctxt)
91 debug("userauth-request for user %s service %s method %s", user, service, method);
92 debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
93
94+ if ((role = strchr(user, '/')) != NULL)
95+ *role++ = 0;
96+
97 if ((style = strchr(user, ':')) != NULL)
98 *style++ = 0;
99+ else if (role && (style = strchr(role, ':')) != NULL)
100+ *style++ = '\0';
101
102 if (authctxt->attempt++ == 0) {
103 /* setup auth context */
104@@ -253,8 +258,9 @@ input_userauth_request(int type, u_int32_t seq, void *ctxt)
105 use_privsep ? " [net]" : "");
106 authctxt->service = xstrdup(service);
107 authctxt->style = style ? xstrdup(style) : NULL;
108+ authctxt->role = role ? xstrdup(role) : NULL;
109 if (use_privsep)
110- mm_inform_authserv(service, style);
111+ mm_inform_authserv(service, style, role);
112 userauth_banner();
113 if (auth2_setup_methods_lists(authctxt) != 0)
114 packet_disconnect("no authentication methods enabled");
115diff --git a/monitor.c b/monitor.c
116index 2658aaa..c063ad1 100644
117--- a/monitor.c
118+++ b/monitor.c
119@@ -127,6 +127,7 @@ int mm_answer_sign(int, Buffer *);
120 int mm_answer_pwnamallow(int, Buffer *);
121 int mm_answer_auth2_read_banner(int, Buffer *);
122 int mm_answer_authserv(int, Buffer *);
123+int mm_answer_authrole(int, Buffer *);
124 int mm_answer_authpassword(int, Buffer *);
125 int mm_answer_bsdauthquery(int, Buffer *);
126 int mm_answer_bsdauthrespond(int, Buffer *);
127@@ -208,6 +209,7 @@ struct mon_table mon_dispatch_proto20[] = {
128 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
129 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
130 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
131+ {MONITOR_REQ_AUTHROLE, MON_ONCE, mm_answer_authrole},
132 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
133 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
134 #ifdef USE_PAM
135@@ -879,6 +881,7 @@ mm_answer_pwnamallow(int sock, Buffer *m)
136 else {
137 /* Allow service/style information on the auth context */
138 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
139+ monitor_permit(mon_dispatch, MONITOR_REQ_AUTHROLE, 1);
140 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
141 }
142 #ifdef USE_PAM
143@@ -909,14 +912,37 @@ mm_answer_authserv(int sock, Buffer *m)
144
145 authctxt->service = buffer_get_string(m, NULL);
146 authctxt->style = buffer_get_string(m, NULL);
147- debug3("%s: service=%s, style=%s",
148- __func__, authctxt->service, authctxt->style);
149+ authctxt->role = buffer_get_string(m, NULL);
150+ debug3("%s: service=%s, style=%s, role=%s",
151+ __func__, authctxt->service, authctxt->style, authctxt->role);
152
153 if (strlen(authctxt->style) == 0) {
154 free(authctxt->style);
155 authctxt->style = NULL;
156 }
157
158+ if (strlen(authctxt->role) == 0) {
159+ free(authctxt->role);
160+ authctxt->role = NULL;
161+ }
162+
163+ return (0);
164+}
165+
166+int
167+mm_answer_authrole(int sock, Buffer *m)
168+{
169+ monitor_permit_authentications(1);
170+
171+ authctxt->role = buffer_get_string(m, NULL);
172+ debug3("%s: role=%s",
173+ __func__, authctxt->role);
174+
175+ if (strlen(authctxt->role) == 0) {
176+ free(authctxt->role);
177+ authctxt->role = NULL;
178+ }
179+
180 return (0);
181 }
182
183@@ -1544,7 +1570,7 @@ mm_answer_pty(int sock, Buffer *m)
184 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
185 if (res == 0)
186 goto error;
187- pty_setowner(authctxt->pw, s->tty);
188+ pty_setowner(authctxt->pw, s->tty, authctxt->role);
189
190 buffer_put_int(m, 1);
191 buffer_put_cstring(m, s->tty);
192diff --git a/monitor.h b/monitor.h
193index bc50ade..2d82b8b 100644
194--- a/monitor.h
195+++ b/monitor.h
196@@ -68,6 +68,8 @@ enum monitor_reqtype {
197 MONITOR_REQ_GSSSIGN = 150, MONITOR_ANS_GSSSIGN = 151,
198 MONITOR_REQ_GSSUPCREDS = 152, MONITOR_ANS_GSSUPCREDS = 153,
199
200+ MONITOR_REQ_AUTHROLE = 154,
201+
202 };
203
204 struct mm_master;
205diff --git a/monitor_wrap.c b/monitor_wrap.c
206index 81ceddb..6799911 100644
207--- a/monitor_wrap.c
208+++ b/monitor_wrap.c
209@@ -327,10 +327,10 @@ mm_auth2_read_banner(void)
210 return (banner);
211 }
212
213-/* Inform the privileged process about service and style */
214+/* Inform the privileged process about service, style, and role */
215
216 void
217-mm_inform_authserv(char *service, char *style)
218+mm_inform_authserv(char *service, char *style, char *role)
219 {
220 Buffer m;
221
222@@ -339,12 +339,30 @@ mm_inform_authserv(char *service, char *style)
223 buffer_init(&m);
224 buffer_put_cstring(&m, service);
225 buffer_put_cstring(&m, style ? style : "");
226+ buffer_put_cstring(&m, role ? role : "");
227
228 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
229
230 buffer_free(&m);
231 }
232
233+/* Inform the privileged process about role */
234+
235+void
236+mm_inform_authrole(char *role)
237+{
238+ Buffer m;
239+
240+ debug3("%s entering", __func__);
241+
242+ buffer_init(&m);
243+ buffer_put_cstring(&m, role ? role : "");
244+
245+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHROLE, &m);
246+
247+ buffer_free(&m);
248+}
249+
250 /* Do the password authentication */
251 int
252 mm_auth_password(Authctxt *authctxt, char *password)
253diff --git a/monitor_wrap.h b/monitor_wrap.h
254index 9758290..57e740f 100644
255--- a/monitor_wrap.h
256+++ b/monitor_wrap.h
257@@ -41,7 +41,8 @@ void mm_log_handler(LogLevel, const char *, void *);
258 int mm_is_monitor(void);
259 DH *mm_choose_dh(int, int, int);
260 int mm_key_sign(Key *, u_char **, u_int *, const u_char *, u_int);
261-void mm_inform_authserv(char *, char *);
262+void mm_inform_authserv(char *, char *, char *);
263+void mm_inform_authrole(char *);
264 struct passwd *mm_getpwnamallow(const char *);
265 char *mm_auth2_read_banner(void);
266 int mm_auth_password(struct Authctxt *, char *);
267diff --git a/openbsd-compat/port-linux.c b/openbsd-compat/port-linux.c
268index f36999d..f9cdc15 100644
269--- a/openbsd-compat/port-linux.c
270+++ b/openbsd-compat/port-linux.c
271@@ -29,6 +29,12 @@
272 #include <string.h>
273 #include <stdio.h>
274
275+#ifdef WITH_SELINUX
276+#include "key.h"
277+#include "hostfile.h"
278+#include "auth.h"
279+#endif
280+
281 #include "log.h"
282 #include "xmalloc.h"
283 #include "port-linux.h"
284@@ -58,7 +64,7 @@ ssh_selinux_enabled(void)
285
286 /* Return the default security context for the given username */
287 static security_context_t
288-ssh_selinux_getctxbyname(char *pwname)
289+ssh_selinux_getctxbyname(char *pwname, const char *role)
290 {
291 security_context_t sc = NULL;
292 char *sename = NULL, *lvl = NULL;
293@@ -73,9 +79,16 @@ ssh_selinux_getctxbyname(char *pwname)
294 #endif
295
296 #ifdef HAVE_GET_DEFAULT_CONTEXT_WITH_LEVEL
297- r = get_default_context_with_level(sename, lvl, NULL, &sc);
298+ if (role != NULL && role[0])
299+ r = get_default_context_with_rolelevel(sename, role, lvl, NULL,
300+ &sc);
301+ else
302+ r = get_default_context_with_level(sename, lvl, NULL, &sc);
303 #else
304- r = get_default_context(sename, NULL, &sc);
305+ if (role != NULL && role[0])
306+ r = get_default_context_with_role(sename, role, NULL, &sc);
307+ else
308+ r = get_default_context(sename, NULL, &sc);
309 #endif
310
311 if (r != 0) {
312@@ -105,7 +118,7 @@ ssh_selinux_getctxbyname(char *pwname)
313
314 /* Set the execution context to the default for the specified user */
315 void
316-ssh_selinux_setup_exec_context(char *pwname)
317+ssh_selinux_setup_exec_context(char *pwname, const char *role)
318 {
319 security_context_t user_ctx = NULL;
320
321@@ -114,7 +127,7 @@ ssh_selinux_setup_exec_context(char *pwname)
322
323 debug3("%s: setting execution context", __func__);
324
325- user_ctx = ssh_selinux_getctxbyname(pwname);
326+ user_ctx = ssh_selinux_getctxbyname(pwname, role);
327 if (setexeccon(user_ctx) != 0) {
328 switch (security_getenforce()) {
329 case -1:
330@@ -136,7 +149,7 @@ ssh_selinux_setup_exec_context(char *pwname)
331
332 /* Set the TTY context for the specified user */
333 void
334-ssh_selinux_setup_pty(char *pwname, const char *tty)
335+ssh_selinux_setup_pty(char *pwname, const char *tty, const char *role)
336 {
337 security_context_t new_tty_ctx = NULL;
338 security_context_t user_ctx = NULL;
339@@ -147,7 +160,7 @@ ssh_selinux_setup_pty(char *pwname, const char *tty)
340
341 debug3("%s: setting TTY context on %s", __func__, tty);
342
343- user_ctx = ssh_selinux_getctxbyname(pwname);
344+ user_ctx = ssh_selinux_getctxbyname(pwname, role);
345
346 /* XXX: should these calls fatal() upon failure in enforcing mode? */
347
348diff --git a/openbsd-compat/port-linux.h b/openbsd-compat/port-linux.h
349index e3d1004..80ce13a 100644
350--- a/openbsd-compat/port-linux.h
351+++ b/openbsd-compat/port-linux.h
352@@ -21,8 +21,8 @@
353
354 #ifdef WITH_SELINUX
355 int ssh_selinux_enabled(void);
356-void ssh_selinux_setup_pty(char *, const char *);
357-void ssh_selinux_setup_exec_context(char *);
358+void ssh_selinux_setup_pty(char *, const char *, const char *);
359+void ssh_selinux_setup_exec_context(char *, const char *);
360 void ssh_selinux_change_context(const char *);
361 void ssh_selinux_setfscreatecon(const char *);
362 #endif
363diff --git a/platform.c b/platform.c
364index ee313da..f35ec39 100644
365--- a/platform.c
366+++ b/platform.c
367@@ -143,7 +143,7 @@ platform_setusercontext(struct passwd *pw)
368 * called if sshd is running as root.
369 */
370 void
371-platform_setusercontext_post_groups(struct passwd *pw)
372+platform_setusercontext_post_groups(struct passwd *pw, const char *role)
373 {
374 #if !defined(HAVE_LOGIN_CAP) && defined(USE_PAM)
375 /*
376@@ -184,7 +184,7 @@ platform_setusercontext_post_groups(struct passwd *pw)
377 }
378 #endif /* HAVE_SETPCRED */
379 #ifdef WITH_SELINUX
380- ssh_selinux_setup_exec_context(pw->pw_name);
381+ ssh_selinux_setup_exec_context(pw->pw_name, role);
382 #endif
383 }
384
385diff --git a/platform.h b/platform.h
386index 1c7a45d..436ae7c 100644
387--- a/platform.h
388+++ b/platform.h
389@@ -27,7 +27,7 @@ void platform_post_fork_parent(pid_t child_pid);
390 void platform_post_fork_child(void);
391 int platform_privileged_uidswap(void);
392 void platform_setusercontext(struct passwd *);
393-void platform_setusercontext_post_groups(struct passwd *);
394+void platform_setusercontext_post_groups(struct passwd *, const char *);
395 char *platform_get_krb5_client(const char *);
396 char *platform_krb5_get_principal_name(const char *);
397 int platform_sys_dir_uid(uid_t);
398diff --git a/session.c b/session.c
399index 5a64715..afac4a5 100644
400--- a/session.c
401+++ b/session.c
402@@ -1487,7 +1487,7 @@ safely_chroot(const char *path, uid_t uid)
403
404 /* Set login name, uid, gid, and groups. */
405 void
406-do_setusercontext(struct passwd *pw)
407+do_setusercontext(struct passwd *pw, const char *role)
408 {
409 char *chroot_path, *tmp;
410 #ifdef USE_LIBIAF
411@@ -1518,7 +1518,7 @@ do_setusercontext(struct passwd *pw)
412 endgrent();
413 #endif
414
415- platform_setusercontext_post_groups(pw);
416+ platform_setusercontext_post_groups(pw, role);
417
418 if (options.chroot_directory != NULL &&
419 strcasecmp(options.chroot_directory, "none") != 0) {
420@@ -1677,7 +1677,7 @@ do_child(Session *s, const char *command)
421
422 /* Force a password change */
423 if (s->authctxt->force_pwchange) {
424- do_setusercontext(pw);
425+ do_setusercontext(pw, s->authctxt->role);
426 child_close_fds();
427 do_pwchange(s);
428 exit(1);
429@@ -1704,7 +1704,7 @@ do_child(Session *s, const char *command)
430 /* When PAM is enabled we rely on it to do the nologin check */
431 if (!options.use_pam)
432 do_nologin(pw);
433- do_setusercontext(pw);
434+ do_setusercontext(pw, s->authctxt->role);
435 /*
436 * PAM session modules in do_setusercontext may have
437 * generated messages, so if this in an interactive
438@@ -2115,7 +2115,7 @@ session_pty_req(Session *s)
439 tty_parse_modes(s->ttyfd, &n_bytes);
440
441 if (!use_privsep)
442- pty_setowner(s->pw, s->tty);
443+ pty_setowner(s->pw, s->tty, s->authctxt->role);
444
445 /* Set window size from the packet. */
446 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
447diff --git a/session.h b/session.h
448index 6a2f35e..ef6593c 100644
449--- a/session.h
450+++ b/session.h
451@@ -77,7 +77,7 @@ void session_pty_cleanup2(Session *);
452 Session *session_new(void);
453 Session *session_by_tty(char *);
454 void session_close(Session *);
455-void do_setusercontext(struct passwd *);
456+void do_setusercontext(struct passwd *, const char *);
457 void child_set_env(char ***envp, u_int *envsizep, const char *name,
458 const char *value);
459
460diff --git a/sshd.c b/sshd.c
461index 0e30e6e..0537bc9 100644
462--- a/sshd.c
463+++ b/sshd.c
464@@ -782,7 +782,7 @@ privsep_postauth(Authctxt *authctxt)
465 explicit_bzero(rnd, sizeof(rnd));
466
467 /* Drop privileges */
468- do_setusercontext(authctxt->pw);
469+ do_setusercontext(authctxt->pw, authctxt->role);
470
471 skip:
472 /* It is safe now to apply the key state */
473diff --git a/sshpty.c b/sshpty.c
474index 15da8c6..e89efb7 100644
475--- a/sshpty.c
476+++ b/sshpty.c
477@@ -187,7 +187,7 @@ pty_change_window_size(int ptyfd, u_int row, u_int col,
478 }
479
480 void
481-pty_setowner(struct passwd *pw, const char *tty)
482+pty_setowner(struct passwd *pw, const char *tty, const char *role)
483 {
484 struct group *grp;
485 gid_t gid;
486@@ -209,7 +209,7 @@ pty_setowner(struct passwd *pw, const char *tty)
487 strerror(errno));
488
489 #ifdef WITH_SELINUX
490- ssh_selinux_setup_pty(pw->pw_name, tty);
491+ ssh_selinux_setup_pty(pw->pw_name, tty, role);
492 #endif
493
494 if (st.st_uid != pw->pw_uid || st.st_gid != gid) {
495diff --git a/sshpty.h b/sshpty.h
496index cfa3224..edf2436 100644
497--- a/sshpty.h
498+++ b/sshpty.h
499@@ -24,4 +24,4 @@ int pty_allocate(int *, int *, char *, size_t);
500 void pty_release(const char *);
501 void pty_make_controlling_tty(int *, const char *);
502 void pty_change_window_size(int, u_int, u_int, u_int, u_int);
503-void pty_setowner(struct passwd *, const char *);
504+void pty_setowner(struct passwd *, const char *, const char *);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 18:19:25 +0000