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* Makefiles: syntax, convert all ${VAR} to $(VAR) 

* load_policy: handle selinux=0 and /sys/fs/selinux not exist
	* regenerate .pc on VERSION change
	* label: cosmetic cleanups
	* simple interface for access checks
	* Don't reinitialize avc_init if it has been called previously
	* seusers: fix to handle large sets of groups
	* audit2why: close fd on enomem
	* rename and export symlink_realpath
	* label_file: style changes to make Eric happy.
This commit is contained in:
Dan Walsh 2011-11-04 09:13:56 -04:00
parent 8075466849
commit 5cb2893d59
4 changed files with 148 additions and 222 deletions
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1
.gitignore vendored
View File

@ -188,3 +188,4 @@ libselinux-2.0.96.tgz
/libselinux-2.1.4.tgz
/libselinux-2.1.5.tgz
/libselinux-2.1.6.tgz
/libselinux-2.1.7.tgz

349
libselinux-rhat.patch
View File

@ -1,78 +1,77 @@
diff --git a/libselinux/include/selinux/label.h b/libselinux/include/selinux/label.h
index 1a54307..f6eeb21 100644
--- a/libselinux/include/selinux/label.h
+++ b/libselinux/include/selinux/label.h
@@ -46,8 +46,10 @@ struct selabel_handle;
#define SELABEL_OPT_PATH 3
/* select a subset of the search space as an optimization (file backend) */
#define SELABEL_OPT_SUBSET 4
+/* like subset, but an array of subsets */
+#define SELABEL_OPT_PREFIXES 5
/* total number of options */
-#define SELABEL_NOPT 5
+#define SELABEL_NOPT 6
/*
* Label operations
diff --git a/libselinux/include/selinux/selinux.h b/libselinux/include/selinux/selinux.h
index d29b0c1..792e68e 100644
index 2985f6f..826ed71 100644
--- a/libselinux/include/selinux/selinux.h
+++ b/libselinux/include/selinux/selinux.h
@@ -500,6 +500,25 @@ extern const char *selinux_colors_path(void);
extern const char *selinux_netfilter_context_path(void);
extern const char *selinux_path(void);
@@ -139,7 +139,10 @@ struct av_decision {
/* Structure for passing options, used by AVC and label subsystems */
struct selinux_opt {
int type;
- const char *value;
+ union {
+ const char *value;
+ const char **values;
+ };
};
+/**
+ * selinux_check_access - Check permissions and perform appropriate auditing.
+ * @scon: source security context
+ * @tcon: target security context
+ * @tclass: target security class string
+ * @perm: requested permissions string, interpreted based on @tclass
+ * @auditdata: auxiliary audit data
+ *
+ * Check the AVC to determine whether the @perm permissions are granted
+ * for the SID pair (@scon, @tcon), interpreting the permissions
+ * based on @tclass.
+ * Return %0 if all @perm permissions are granted, -%1 with
+ * @errno set to %EACCES if any permissions are denied or to another
+ * value upon other errors.
+ * If auditing or logging is configured the appropriate callbacks will be called
+ * and passed the auditdata field
+ */
+extern int selinux_check_access(const security_context_t scon, const security_context_t tcon, const char *tclass, const char *perm, void *auditdata);
/* Callback facilities */
@@ -410,6 +413,11 @@ extern int matchpathcon_init(const char *path);
regexes that have stems that are prefixes of 'prefix'. */
extern int matchpathcon_init_prefix(const char *path, const char *prefix);
+/* Same as matchpathcon_init, but only load entries with
+ * regexes that have stems that are prefixes of the 'prefixes'
+ * array of entries. The last entry must be NULL. */
+extern int matchpathcon_init_prefixes(const char *patch, const char **prefixes);
+
/* Check a permission in the passwd class.
Return 0 if granted or -1 otherwise. */
extern int selinux_check_passwd_access(access_vector_t requested);
/* Free the memory allocated by matchpathcon_init. */
extern void matchpathcon_fini(void);
diff --git a/libselinux/man/man3/matchpathcon.3 b/libselinux/man/man3/matchpathcon.3
index cdbb252..e2a4371 100644
index cdbb252..b6814ed 100644
--- a/libselinux/man/man3/matchpathcon.3
+++ b/libselinux/man/man3/matchpathcon.3
@@ -8,7 +8,7 @@ matchpathcon, matchpathcon_index \- get the default SELinux security context for
@@ -8,7 +8,9 @@ matchpathcon, matchpathcon_index \- get the default SELinux security context for
.BI "int matchpathcon_init(const char *" path ");"
-.BI "int matchpathcon_init_prefix(const char *" path ", const char *" subset ");"
+.BI "int matchpathcon_init_prefix(const char *" path ", const char *" prefix ");"
+
+.BI "int matchpathcon_init_prefixes(const char *" path ", const char **" prefixes ");"
.BI "int matchpathcon_fini(void);"
.sp
@@ -48,7 +48,7 @@ is the same as
but only loads entries with regular expressions that have stems prefixed
by
@@ -50,6 +52,14 @@ by
.I prefix.
-
+prefix can have multiple paths separated by ":", for example "/dev:/var/run:/tmp"
.sp
+.B matchpathcon_init_prefixes
+is the same as
+.B matchpathcon_init_prefix
+but takes an array of
+.I prefixes
+instead of a single prefix. The last entry in the array must be NULL.
+
+.sp
.B matchpathcon_fini
frees the memory allocated by a prior call to
diff --git a/libselinux/man/man3/security_compute_av.3 b/libselinux/man/man3/security_compute_av.3
index f2d9f30..1e36952 100644
--- a/libselinux/man/man3/security_compute_av.3
+++ b/libselinux/man/man3/security_compute_av.3
@@ -24,6 +24,8 @@ the SELinux policy database in the kernel.
.BI "int security_get_initial_context(const char *" name ", security_context_t
"con );
.sp
+.BI "int selinux_check_access(const security_context_t " scon, " const security_context_t " tcon, " const char *" class, " const char *" perm, "void *" auditdata);
+.sp
.BI "int selinux_check_passwd_access(access_vector_t " requested );
.sp
.BI "int checkPasswdAccess(access_vector_t " requested );
@@ -74,6 +76,9 @@ source context. It is mainly used by
is used to get the context of a kernel initial security identifier specified by
.I name
+.B selinux_check_access
+is used to check if the source context has the access permission for the specified class on the target context.
+
.B selinux_check_passwd_access
is used to check for a permission in the
.I passwd
.B matchpathcon_init.
diff --git a/libselinux/man/man3/selabel_open.3 b/libselinux/man/man3/selabel_open.3
index 8674e37..89bb4d3 100644
--- a/libselinux/man/man3/selabel_open.3
@ -96,27 +95,6 @@ index 8674e37..89bb4d3 100644
.BR selinux_set_callback (3),
.BR selinux (8)
-
diff --git a/libselinux/man/man3/selinux_check_access.3 b/libselinux/man/man3/selinux_check_access.3
new file mode 100644
index 0000000..a60bca4
--- /dev/null
+++ b/libselinux/man/man3/selinux_check_access.3
@@ -0,0 +1 @@
+.so man3/security_compute_av.3
diff --git a/libselinux/src/avc.c b/libselinux/src/avc.c
index 74591b4..e7ad31d 100644
--- a/libselinux/src/avc.c
+++ b/libselinux/src/avc.c
@@ -165,6 +165,9 @@ int avc_init(const char *prefix,
struct avc_node *new;
int i, rc = 0;
+ if (avc_running)
+ return 0;
+
if (prefix)
strncpy(avc_prefix, prefix, AVC_PREFIX_SIZE - 1);
diff --git a/libselinux/src/callbacks.c b/libselinux/src/callbacks.c
index b245364..7c47222 100644
--- a/libselinux/src/callbacks.c
@ -129,53 +107,8 @@ index b245364..7c47222 100644
va_start(ap, fmt);
rc = vfprintf(stderr, fmt, ap);
va_end(ap);
diff --git a/libselinux/src/checkAccess.c b/libselinux/src/checkAccess.c
index c1982c7..59c8abb 100644
--- a/libselinux/src/checkAccess.c
+++ b/libselinux/src/checkAccess.c
@@ -4,8 +4,40 @@
#include <errno.h>
#include "selinux_internal.h"
#include <selinux/flask.h>
+#include <selinux/avc.h>
#include <selinux/av_permissions.h>
+static pthread_once_t once = PTHREAD_ONCE_INIT;
+
+static void avc_init_once(void)
+{
+ avc_open(NULL, 0);
+}
+
+int selinux_check_access(const security_context_t scon, const security_context_t tcon, const char *class, const char *perm, void *aux) {
+ int status = -1;
+ int rc = -1;
+ security_id_t scon_id;
+ security_id_t tcon_id;
+ security_class_t sclass;
+ access_vector_t av;
+
+ if (is_selinux_enabled() == 0)
+ return 0;
+
+ __selinux_once(once, avc_init_once);
+
+ if ((rc = avc_context_to_sid(scon, &scon_id)) < 0) return rc;
+
+ if ((rc = avc_context_to_sid(tcon, &tcon_id)) < 0) return rc;
+
+ if ((sclass = string_to_security_class(class)) == 0) return status;
+
+ if ((av = string_to_av_perm(sclass, perm)) == 0) return status;
+
+ return avc_has_perm (scon_id, tcon_id, sclass, av, NULL, aux);
+}
+
int selinux_check_passwd_access(access_vector_t requested)
{
int status = -1;
diff --git a/libselinux/src/label_file.c b/libselinux/src/label_file.c
index 3b8346d..02f3f98 100644
index ac11b37..42889cf 100644
--- a/libselinux/src/label_file.c
+++ b/libselinux/src/label_file.c
@@ -27,6 +27,7 @@
@ -186,7 +119,7 @@ index 3b8346d..02f3f98 100644
/* A file security context specification. */
typedef struct spec {
struct selabel_lookup_rec lr; /* holds contexts for lookup result */
@@ -279,7 +280,7 @@ static int compile_regex(struct saved_data *data, spec_t *spec, char **errbuf)
@@ -276,7 +277,7 @@ static int compile_regex(struct saved_data *data, spec_t *spec, char **errbuf)
static int process_line(struct selabel_handle *rec,
@ -195,7 +128,7 @@ index 3b8346d..02f3f98 100644
char *line_buf, int pass, unsigned lineno)
{
int items, len;
@@ -313,12 +314,24 @@ static int process_line(struct selabel_handle *rec,
@@ -310,12 +311,24 @@ static int process_line(struct selabel_handle *rec,
}
len = get_stem_from_spec(regex);
@ -226,78 +159,57 @@ index 3b8346d..02f3f98 100644
}
if (pass == 1) {
@@ -400,7 +413,7 @@ static int init(struct selabel_handle *rec, struct selinux_opt *opts,
@@ -397,7 +410,8 @@ static int init(struct selabel_handle *rec, struct selinux_opt *opts,
{
struct saved_data *data = (struct saved_data *)rec->data;
const char *path = NULL;
- const char *prefix = NULL;
+ const char *prefix_array[MAX_PREFIX] = {NULL,};
+ const char *static_prefix_array[2] = {NULL, };
+ const char **prefix_array = static_prefix_array;
FILE *fp;
FILE *localfp = NULL;
FILE *homedirfp = NULL;
@@ -421,8 +434,19 @@ static int init(struct selabel_handle *rec, struct selinux_opt *opts,
@@ -418,7 +432,10 @@ static int init(struct selabel_handle *rec, struct selinux_opt *opts,
path = opts[n].value;
break;
case SELABEL_OPT_SUBSET:
- prefix = opts[n].value;
+ {
+ char *ptr;
+ i = 0;
+ if (opts[n].value) {
+ prefix_array[i] = strtok_r((char *)opts[n].value, ":", &ptr);
+ while ((prefix_array[i] != NULL) && i < MAX_PREFIX - 1) {
+ i++;
+ prefix_array[i] = strtok_r(NULL, ":", &ptr);
+ }
+ }
+
+ static_prefix_array[0] = opts[n].value;
+ break;
+ case SELABEL_OPT_PREFIXES:
+ prefix_array = opts[n].values;
break;
+ }
case SELABEL_OPT_BASEONLY:
baseonly = !!opts[n].value;
break;
@@ -481,7 +505,7 @@ static int init(struct selabel_handle *rec, struct selinux_opt *opts,
data->ncomp = 0;
while (getline(&line_buf, &line_len, fp) > 0
&& data->nspec < maxnspec) {
- if (process_line(rec, path, prefix, line_buf,
+ if (process_line(rec, path, prefix_array, line_buf,
pass, ++lineno) != 0)
@@ -480,7 +497,7 @@ static int init(struct selabel_handle *rec, struct selinux_opt *opts,
while (getline(&line_buf, &line_len, fp) > 0) {
if (data->nspec >= maxnspec)
break;
- status = process_line(rec, path, prefix, line_buf, pass, ++lineno);
+ status = process_line(rec, path, prefix_array, line_buf, pass, ++lineno);
if (status)
goto finish;
}
@@ -495,7 +519,7 @@ static int init(struct selabel_handle *rec, struct selinux_opt *opts,
while (getline(&line_buf, &line_len, homedirfp) > 0
&& data->nspec < maxnspec) {
if (process_line
- (rec, homedir_path, prefix,
+ (rec, homedir_path, prefix_array,
line_buf, pass, ++lineno) != 0)
@@ -496,7 +513,7 @@ static int init(struct selabel_handle *rec, struct selinux_opt *opts,
while (getline(&line_buf, &line_len, homedirfp) > 0) {
if (data->nspec >= maxnspec)
break;
- status = process_line(rec, homedir_path, prefix, line_buf, pass, ++lineno);
+ status = process_line(rec, homedir_path, prefix_array, line_buf, pass, ++lineno);
if (status)
goto finish;
}
@@ -505,7 +529,7 @@ static int init(struct selabel_handle *rec, struct selinux_opt *opts,
while (getline(&line_buf, &line_len, localfp) > 0
&& data->nspec < maxnspec) {
if (process_line
- (rec, local_path, prefix, line_buf,
+ (rec, local_path, prefix_array, line_buf,
pass, ++lineno) != 0)
@@ -506,7 +523,7 @@ static int init(struct selabel_handle *rec, struct selinux_opt *opts,
while (getline(&line_buf, &line_len, localfp) > 0) {
if (data->nspec >= maxnspec)
break;
- status = process_line(rec, local_path, prefix, line_buf, pass, ++lineno);
+ status = process_line(rec, local_path, prefix_array, line_buf, pass, ++lineno);
if (status)
goto finish;
}
diff --git a/libselinux/src/load_policy.c b/libselinux/src/load_policy.c
index 868660f..7fa6383 100644
--- a/libselinux/src/load_policy.c
+++ b/libselinux/src/load_policy.c
@@ -380,7 +380,7 @@ int selinux_init_load_policy(int *enforce)
}
if (! mntpoint ) {
- if (errno == ENODEV) {
+ if (errno == ENODEV || errno == ENOENT) {
/*
* SELinux was disabled in the kernel, either
* omitted entirely or disabled at boot via selinux=0.
diff --git a/libselinux/src/matchpathcon.c b/libselinux/src/matchpathcon.c
index 5914afa..df83b30 100644
index c396add..489ef3a 100644
--- a/libselinux/src/matchpathcon.c
+++ b/libselinux/src/matchpathcon.c
@@ -2,6 +2,7 @@
@ -317,48 +229,49 @@ index 5914afa..df83b30 100644
va_end(ap);
}
diff --git a/libselinux/src/seusers.c b/libselinux/src/seusers.c
index fc75cb6..b653cad 100644
--- a/libselinux/src/seusers.c
+++ b/libselinux/src/seusers.c
@@ -5,6 +5,7 @@
#include <stdio.h>
#include <stdio_ext.h>
#include <ctype.h>
+#include <errno.h>
#include <selinux/selinux.h>
#include <selinux/context.h>
#include "selinux_internal.h"
@@ -118,13 +119,26 @@ static int check_group(const char *group, const char *name, const gid_t gid) {
long rbuflen = sysconf(_SC_GETGR_R_SIZE_MAX);
if (rbuflen <= 0)
return 0;
- char *rbuf = malloc(rbuflen);
- if (rbuf == NULL)
- return 0;
+ char *rbuf;
@@ -304,7 +305,7 @@ static void matchpathcon_init_once(void)
destructor_key_initialized = 1;
}
- if (getgrnam_r(group, &gbuf, rbuf, rbuflen,
- &grent) != 0)
- goto done;
+ while(1) {
+ rbuf = malloc(rbuflen);
+ if (rbuf == NULL)
+ return 0;
+ int retval = getgrnam_r(group, &gbuf, rbuf,
+ rbuflen, &grent);
+ if ( retval == ERANGE )
+ {
+ free(rbuf);
+ rbuflen = rbuflen * 2;
+ } else if ( retval != 0 || grent == NULL )
+ {
+ goto done;
+ } else
+ {
+ break;
+ }
+ }
-int matchpathcon_init_prefix(const char *path, const char *subset)
+int matchpathcon_init_prefixes(const char *path, const char **prefixes)
{
if (!mycanoncon)
mycanoncon = default_canoncon;
@@ -312,15 +313,22 @@ int matchpathcon_init_prefix(const char *path, const char *subset)
__selinux_once(once, matchpathcon_init_once);
__selinux_setspecific(destructor_key, (void *)1);
if (getgrouplist(name, gid, NULL, &ng) < 0) {
groups = (gid_t *) malloc(sizeof (gid_t) * ng);
- options[SELABEL_OPT_SUBSET].type = SELABEL_OPT_SUBSET;
- options[SELABEL_OPT_SUBSET].value = subset;
+ options[SELABEL_OPT_PREFIXES].type = SELABEL_OPT_PREFIXES;
+ options[SELABEL_OPT_PREFIXES].values = prefixes;
options[SELABEL_OPT_PATH].type = SELABEL_OPT_PATH;
options[SELABEL_OPT_PATH].value = path;
hnd = selabel_open(SELABEL_CTX_FILE, options, SELABEL_NOPT);
return hnd ? 0 : -1;
}
+hidden_def(matchpathcon_init_prefixes)
+int matchpathcon_init_prefix(const char *path, const char *prefix)
+{
+ const char *prefixes[2] = { prefix, NULL };
+
+ return matchpathcon_init_prefixes(path, prefixes);
+}
hidden_def(matchpathcon_init_prefix)
int matchpathcon_init(const char *path)
diff --git a/libselinux/src/selinux_internal.h b/libselinux/src/selinux_internal.h
index 710396a..9a3fc14 100644
--- a/libselinux/src/selinux_internal.h
+++ b/libselinux/src/selinux_internal.h
@@ -80,6 +80,7 @@ hidden_proto(selinux_mkload_policy)
hidden_proto(selinux_path)
hidden_proto(selinux_check_passwd_access)
hidden_proto(selinux_check_securetty_context)
+ hidden_proto(matchpathcon_init_prefixes)
hidden_proto(matchpathcon_init_prefix)
hidden_proto(selinux_users_path)
hidden_proto(selinux_usersconf_path);

18
libselinux.spec
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@ -1,13 +1,13 @@
%global with_python3 1
%define ruby_sitearch %(ruby -rrbconfig -e "puts Config::CONFIG['sitearchdir']")
%define libsepolver 2.1.3-1
%define libsepolver 2.1.3-2
%{!?python_sitearch: %define python_sitearch %(%{__python} -c "from distutils.sysconfig import get_python_lib; print get_python_lib(1)")}
Summary: SELinux library and simple utilities
Name: libselinux
Version: 2.1.6
Release: 4%{?dist}
Version: 2.1.7
Release: 1%{?dist}
License: Public Domain
Group: System Environment/Libraries
Source: %{name}-%{version}.tgz
@ -231,6 +231,18 @@ rm -rf %{buildroot}
%{ruby_sitearch}/selinux.so
%changelog
* Fri Nov 4 2011 Dan Walsh <dwalsh@redhat.com> - 2.1.7-1
* Makefiles: syntax, convert all ${VAR} to $(VAR)
* load_policy: handle selinux=0 and /sys/fs/selinux not exist
* regenerate .pc on VERSION change
* label: cosmetic cleanups
* simple interface for access checks
* Don't reinitialize avc_init if it has been called previously
* seusers: fix to handle large sets of groups
* audit2why: close fd on enomem
* rename and export symlink_realpath
* label_file: style changes to make Eric happy.
* Mon Oct 24 2011 Dan Walsh <dwalsh@redhat.com> - 2.1.6-4
- Apply libselinux patch to handle large groups in seusers.

2
sources
View File

@ -1 +1 @@
94fa8daf439f79db14821d4ff7f68f98 libselinux-2.1.6.tgz
77352e66fff6d0a48b30dc851dc50f82 libselinux-2.1.7.tgz