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- Fix selection of role

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This commit is contained in:
Daniel J Walsh 2007-01-03 19:18:27 +00:00
parent 03d7f35c89
commit 7ce306a7c7
2 changed files with 213 additions and 65 deletions
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267
pam-0.99.6.2-selinux-select-context.patch
View File

@ -1,5 +1,5 @@
--- Linux-PAM-0.99.6.2/modules/pam_selinux/pam_selinux.8.xml.select-context 2006-11-10 17:48:59.000000000 +0100
+++ Linux-PAM-0.99.6.2/modules/pam_selinux/pam_selinux.8.xml 2006-11-10 17:52:36.000000000 +0100
--- Linux-PAM-0.99.6.2/modules/pam_selinux/pam_selinux.8.xml.select-context 2006-12-27 10:59:06.000000000 -0500
+++ Linux-PAM-0.99.6.2/modules/pam_selinux/pam_selinux.8.xml 2006-12-27 10:59:06.000000000 -0500
@@ -33,6 +33,9 @@
<arg choice="opt">
verbose
@ -28,36 +28,154 @@
</variablelist>
</refsect1>
--- Linux-PAM-0.99.6.2/modules/pam_selinux/pam_selinux.c.select-context 2006-11-10 17:48:59.000000000 +0100
+++ Linux-PAM-0.99.6.2/modules/pam_selinux/pam_selinux.c 2006-11-10 18:00:11.000000000 +0100
@@ -63,6 +63,7 @@
--- Linux-PAM-0.99.6.2/modules/pam_selinux/pam_selinux.c.select-context 2006-12-27 10:59:06.000000000 -0500
+++ Linux-PAM-0.99.6.2/modules/pam_selinux/pam_selinux.c 2007-01-03 13:40:24.000000000 -0500
@@ -63,8 +63,10 @@
#include <selinux/selinux.h>
#include <selinux/get_context_list.h>
#include <selinux/flask.h>
+#include <selinux/av_permissions.h>
#include <selinux/selinux.h>
#include <selinux/context.h>
+#include <selinux/get_default_type.h>
@@ -151,6 +152,8 @@
static int
send_text (pam_handle_t *pamh, const char *text, int debug)
@@ -79,69 +81,64 @@
* is responsible for freeing the responses.
*/
static int
-query_response (pam_handle_t *pamh, const char *text,
+query_response (pam_handle_t *pamh, const char *text, const char *def,
char **responses, int debug)
{
+ int rc;
+ if (def)
+ rc = pam_prompt (pamh, PAM_PROMPT_ECHO_ON, responses, "%s [%s] ", text, def);
+ else
+ rc = pam_prompt (pamh, PAM_PROMPT_ECHO_ON, responses, "%s ", text);
if (debug)
- pam_syslog(pamh, LOG_NOTICE, "%s", text);
-
- return pam_prompt (pamh, PAM_PROMPT_ECHO_ON, responses, "%s", text);
+ pam_syslog(pamh, LOG_NOTICE, "%s %s", text, responses[0]);
+ return rc;
}
static security_context_t
manual_context (pam_handle_t *pamh, const char *user, int debug)
{
- security_context_t newcon;
+ security_context_t newcon=NULL;
context_t new_context;
int mls_enabled = is_selinux_mls_enabled();
-
- char *responses;
+ char *type=NULL;
+ char *responses=NULL;
while (1) {
query_response(pamh,
- _("Would you like to enter a security context? [y] "),
+ _("Would you like to enter a security context? [n] "), NULL,
&responses,debug);
- if ((responses[0] == 'y') || (responses[0] == 'Y') ||
- (responses[0] == '\0') )
+ if ((responses[0] == 'y') || (responses[0] == 'Y'))
{
if (mls_enabled)
new_context = context_new ("user:role:type:level");
else
new_context = context_new ("user:role:type");
- _pam_drop(responses);
- /* Allow the user to enter each field of the context individually */
+ if (!new_context)
+ goto fail_set;
+
if (context_user_set (new_context, user))
- {
- context_free (new_context);
- return NULL;
- }
- query_response(pamh,_("role: "),&responses,debug);
- if (context_role_set (new_context, responses))
- {
- _pam_drop(responses);
- context_free (new_context);
- return NULL;
- }
+ goto fail_set;
+
_pam_drop(responses);
- query_response(pamh,_("type: "),&responses,debug);
- if (context_type_set (new_context, responses))
- {
- _pam_drop(responses);
- context_free (new_context);
- return NULL;
- }
+ /* Allow the user to enter each field of the context individually */
+ query_response(pamh,_("role:"), NULL, &responses,debug);
+ if (responses[0] != '\0') {
+ if (context_role_set (new_context, responses))
+ goto fail_set;
+ if (get_default_type(responses, &type))
+ goto fail_set;
+ if (context_type_set (new_context, type))
+ goto fail_set;
+ }
_pam_drop(responses);
if (mls_enabled)
{
- query_response(pamh,_("level: "),&responses,debug);
- if (context_range_set (new_context, responses))
- {
- _pam_drop(responses);
- context_free (new_context);
- return NULL;
- }
- _pam_drop(responses);
+ query_response(pamh,_("level:"), NULL, &responses,debug);
+ if (responses[0] != '\0') {
+ if (context_range_set (new_context, responses))
+ goto fail_set;
+ }
}
/* Get the string value of the context and see if it is valid. */
if (!security_check_context(context_str(new_context))) {
@@ -151,14 +148,125 @@
}
else
send_text(pamh,_("Not a valid security context"),debug);
+
+ context_free(new_context); /* next time around allocates another */
+ context_free (new_context);
}
else {
_pam_drop(responses);
@@ -161,6 +164,86 @@
return NULL;
}
+static int mls_range_allowed(security_context_t src, security_context_t dst)
return NULL;
}
} /* end while */
+ fail_set:
+ free(type);
+ _pam_drop(responses);
+ context_free (new_context);
+ return NULL;
+}
+
+static int mls_range_allowed(pam_handle_t *pamh, security_context_t src, security_context_t dst, int debug)
+{
+ struct av_decision avd;
+ int retval;
+ unsigned int bit = CONTEXT__CONTAINS;
+
+ retval = security_compute_av(src, dst, SECCLASS_CONTEXT, bit, &avd);
+ context_t src_context = context_new (src);
+ context_t dst_context = context_new (dst);
+ context_range_set(dst_context, context_range_get(src_context));
+ if (debug)
+ pam_syslog(pamh, LOG_NOTICE, "Checking if %s mls range valid for %s", dst, context_str(dst_context));
+
+ retval = security_compute_av(context_str(dst_context), dst, SECCLASS_CONTEXT, bit, &avd);
+ context_free(src_context);
+ context_free(dst_context);
+ if (retval || ((bit & avd.allowed) != bit))
+ return 0;
+
@ -67,35 +185,54 @@
+static security_context_t
+config_context (pam_handle_t *pamh, security_context_t puser_context, int debug)
+{
+ security_context_t newcon;
+ security_context_t newcon=NULL;
+ context_t new_context;
+ int mls_enabled = is_selinux_mls_enabled();
+ char *responses;
+ char *responses=NULL;
+ char *type=NULL;
+ char resp_val = 0;
+
+
+ pam_prompt (pamh, PAM_TEXT_INFO, NULL, _("Default Security Context %s\n"), puser_context);
+
+ while (1) {
+ query_response(pamh,
+ _("Would you like to enter a role/level? [y] "),
+ _("Would you like to enter a different role or level?"), "n",
+ &responses,debug);
+
+ resp_val = responses[0];
+ _pam_drop(responses);
+ if ((resp_val == 'y') || (resp_val == 'Y') || (resp_val == '\0'))
+ if ((resp_val == 'y') || (resp_val == 'Y'))
+ {
+ new_context = context_new(puser_context);
+
+ /* Allow the user to enter role and level individually */
+ query_response(pamh,_("role: "),&responses,debug);
+ if (responses[0] && context_role_set(new_context, responses))
+ goto fail_set;
+ query_response(pamh,_("role:"), context_role_get(new_context),
+ &responses, debug);
+ if (responses[0]) {
+ if (get_default_type(responses, &type)) {
+ pam_prompt (pamh, PAM_ERROR_MSG, NULL, _("No default type for role %s\n"), responses);
+ _pam_drop(responses);
+ continue;
+ } else {
+ if (context_role_set(new_context, responses))
+ goto fail_set;
+ if (context_type_set (new_context, type))
+ goto fail_set;
+ }
+ }
+ _pam_drop(responses);
+ if (mls_enabled)
+ {
+ query_response(pamh,_("level: "),&responses,debug);
+ if (responses[0] && context_range_set(new_context, responses))
+ goto fail_set;
+ query_response(pamh,_("level:"), context_range_get(new_context),
+ &responses, debug);
+ if (responses[0]) {
+ if (context_range_set(new_context, responses))
+ goto fail_set;
+ }
+ _pam_drop(responses);
+ }
+ if (debug)
+ pam_syslog(pamh, LOG_NOTICE, "Selected Security Context %s", context_str(new_context));
+
+ /* Get the string value of the context and see if it is valid. */
+ if (!security_check_context(context_str(new_context))) {
@ -105,10 +242,12 @@
+ /* we have to check that this user is allowed to go into the
+ range they have specified ... role is tied to an seuser, so that'll
+ be checked at setexeccon time */
+ if (mls_enabled && !mls_range_allowed(puser_context, newcon))
+ goto fail_range;
+ if (mls_enabled && !mls_range_allowed(pamh, puser_context, newcon, debug)) {
+ pam_syslog(pamh, LOG_NOTICE, "Security context %s is not allowed for %s", puser_context, newcon);
+
+ freecon(puser_context);
+
+ goto fail_range;
+ }
+ return newcon;
+ }
+ else
@ -117,24 +256,21 @@
+ context_free(new_context); /* next time around allocates another */
+ }
+ else
+ break;
+ return strdup(puser_context);
+ } /* end while */
+
+ freecon(puser_context);
+ return NULL;
return NULL;
+
+ fail_set:
+ free(type);
+ _pam_drop(responses);
+ context_free (new_context);
+ fail_range:
+ freecon(puser_context);
+ return NULL;
+}
+
}
static void
security_restorelabel_tty(const pam_handle_t *pamh,
const char *tty, security_context_t context)
@@ -273,10 +356,12 @@
@@ -273,10 +381,11 @@
{
int i, debug = 0, ttys=1, has_tty=isatty(0);
int verbose=0, close_session=0;
@ -143,12 +279,11 @@
security_context_t* contextlist = NULL;
int num_contexts = 0;
- const void *username = NULL;
+ const void *pusername = NULL;
+ const char *username = NULL;
const void *tty = NULL;
char *seuser=NULL;
char *level=NULL;
@@ -295,6 +380,9 @@
@@ -295,6 +404,9 @@
if (strcmp(argv[i], "close") == 0) {
close_session = 1;
}
@ -158,21 +293,16 @@
}
if (debug)
@@ -307,10 +395,11 @@
@@ -307,7 +419,7 @@
if (!(selinux_enabled = is_selinux_enabled()>0) )
return PAM_SUCCESS;
- if (pam_get_item(pamh, PAM_USER, &username) != PAM_SUCCESS ||
- username == NULL) {
+ if (pam_get_item(pamh, PAM_USER, &pusername) != PAM_SUCCESS ||
+ pusername == NULL) {
+ if (pam_get_item(pamh, PAM_USER, (void *) &username) != PAM_SUCCESS ||
username == NULL) {
return PAM_USER_UNKNOWN;
}
+ username = pusername;
if (getseuserbyname(username, &seuser, &level)==0) {
num_contexts = get_ordered_context_list_with_level(seuser,
@@ -319,19 +408,32 @@
@@ -319,19 +431,38 @@
&contextlist);
if (debug)
pam_syslog(pamh, LOG_DEBUG, "Username= %s SELinux User = %s Level= %s",
@ -182,24 +312,33 @@
free(level);
}
if (num_contexts > 0) {
user_context = (security_context_t) strdup(contextlist[0]);
+
- user_context = (security_context_t) strdup(contextlist[0]);
+ security_context_t puser_context=strdup(contextlist[0]);
freeconary(contextlist);
- } else {
+ if (puser_context == NULL) {
+ pam_syslog(pamh, LOG_ERR, _("Out of memory"));
+ return PAM_AUTH_ERR;
+ }
+ user_context = puser_context;
+ if (select_context && has_tty) {
+ user_context = config_context(pamh, user_context, debug);
+ user_context = config_context(pamh, puser_context, debug);
+ freecon(puser_context);
+ if (user_context == NULL) {
+ pam_syslog(pamh, LOG_ERR, "Unable to get valid context for %s",
+ pam_syslog(pamh, LOG_ERR, _("Unable to get valid context for %s"),
+ username);
+ pam_prompt (pamh, PAM_ERROR_MSG, NULL, _("Unable to get valid context for %s"), username);
+ if (security_getenforce() == 1)
+ return PAM_AUTH_ERR;
+ else
+ return PAM_SUCCESS;
+ }
+ }
+
freeconary(contextlist);
} else {
+ }
+ }
+ else {
if (has_tty) {
user_context = manual_context(pamh,username,debug);
- user_context = manual_context(pamh,username,debug);
+ user_context = manual_context(pamh,seuser,debug);
if (user_context == NULL) {
pam_syslog (pamh, LOG_ERR, "Unable to get valid context for %s",
- (const char *)username);
@ -207,7 +346,7 @@
if (security_getenforce() == 1)
return PAM_AUTH_ERR;
else
@@ -340,7 +442,7 @@
@@ -340,7 +471,7 @@
} else {
pam_syslog (pamh, LOG_ERR,
"Unable to get valid context for %s, No valid tty",
@ -216,7 +355,7 @@
if (security_getenforce() == 1)
return PAM_AUTH_ERR;
else
@@ -381,7 +483,7 @@
@@ -381,7 +512,7 @@
if (ret) {
pam_syslog(pamh, LOG_ERR,
"Error! Unable to set %s executable context %s.",
@ -225,7 +364,7 @@
if (security_getenforce() == 1) {
freecon(user_context);
return PAM_AUTH_ERR;
@@ -389,7 +491,7 @@
@@ -389,7 +520,7 @@
} else {
if (debug)
pam_syslog(pamh, LOG_NOTICE, "set %s security context to %s",
@ -234,7 +373,7 @@
}
#ifdef HAVE_SETKEYCREATECON
ret = setkeycreatecon(user_context);
@@ -402,7 +504,7 @@
@@ -402,7 +533,7 @@
if (ret) {
pam_syslog(pamh, LOG_ERR,
"Error! Unable to set %s key creation context %s.",
@ -243,7 +382,7 @@
if (security_getenforce() == 1) {
freecon(user_context);
return PAM_AUTH_ERR;
@@ -410,7 +512,7 @@
@@ -410,7 +541,7 @@
} else {
if (debug)
pam_syslog(pamh, LOG_NOTICE, "set %s key creation context to %s",

11
pam.spec
View File

@ -11,7 +11,7 @@
Summary: A security tool which provides authentication for applications
Name: pam
Version: 0.99.6.2
Release: 5%{?dist}
Release: 7%{?dist}
License: GPL or BSD
Group: System Environment/Base
Source0: http://ftp.us.kernel.org/pub/linux/libs/pam/pre/library/Linux-PAM-%{version}.tar.bz2
@ -41,6 +41,7 @@ Patch90: pam-0.99.6.2-keyinit-setgid.patch
Patch91: pam-0.99.6.2-unix-username.patch
Patch92: pam-0.99.6.2-selinux-select-context.patch
Patch100: pam-0.99.6.2-reconf.patch
Patch101: pam-0.99.6.2-selinux-namespace.patch
BuildRoot: %{_tmppath}/%{name}-root
Requires: cracklib, cracklib-dicts >= 2.8
@ -110,6 +111,7 @@ cp %{SOURCE7} .
%patch92 -p1 -b .select-context
%patch100 -p1 -b .reconf
%patch101 -p1 -b .selinux-namespace
#autoreconf
%build
@ -386,6 +388,13 @@ fi
%doc doc/adg/*.txt doc/adg/html
%changelog
* Thu Dec 1 2006 Dan Walsh <dwalsh@redhat.com> 0.99.6.2-7
- Fix selection of role
* Thu Dec 1 2006 Dan Walsh <dwalsh@redhat.com> 0.99.6.2-6
- Fix pam_namespace to only change MLS componant
Resolves: Bug #216184
* Thu Nov 30 2006 Tomas Mraz <tmraz@redhat.com> 0.99.6.2-5
- add select-context option to pam_selinux (#213812)
- autoreconf won't work with autoconf-2.61 as configure.in is not yet adjusted