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libselinux/libselinux-rhat.patch

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diff --git a/libselinux/include/selinux/selinux.h b/libselinux/include/selinux/selinux.h
index d29b0c1..792e68e 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);
+/**
+ * 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);
+
/* Check a permission in the passwd class.
Return 0 if granted or -1 otherwise. */
extern int selinux_check_passwd_access(access_vector_t requested);
diff --git a/libselinux/man/man3/matchpathcon.3 b/libselinux/man/man3/matchpathcon.3
index cdbb252..e2a4371 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
.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_fini(void);"
.sp
@@ -48,7 +48,7 @@ is the same as
but only loads entries with regular expressions that have stems prefixed
by
.I prefix.
-
+prefix can have multiple paths separated by ":", for example "/dev:/var/run:/tmp"
.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
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
+++ b/libselinux/man/man3/selabel_open.3
@@ -66,6 +66,13 @@ A non-null value for this option enables context validation. By default,
is used; a custom validation function can be provided via
.BR selinux_set_callback (3).
Note that an invalid context may not be treated as an error unless it is actually encountered during a lookup operation.
+.TP
+.B SELABEL_OPT_SUBSET
+A ":" separates string of path prefixes that tell the system to only loads entries with regular expressions that could match this strings. For example "/dev:/var/run:/tmp". This option can cause the system to use less memory and work faster, but you should only use paths that begin with a prefix.
+.TP
+.B SELABEL_OPT_PATH
+A string representing an alternate path the the regular expressions.
+.sp
.SH "BACKENDS"
@@ -99,4 +106,3 @@ Eamon Walsh <ewalsh@tycho.nsa.gov>
.BR selabel_stats (3),
.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
+++ b/libselinux/src/callbacks.c
@@ -16,6 +16,7 @@ default_selinux_log(int type __attribute__((unused)), const char *fmt, ...)
{
int rc;
va_list ap;
+ if (is_selinux_enabled() == 0) return 0;
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
--- a/libselinux/src/label_file.c
+++ b/libselinux/src/label_file.c
@@ -27,6 +27,7 @@
* Internals, mostly moved over from matchpathcon.c
*/
+#define MAX_PREFIX 100
/* 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)
static int process_line(struct selabel_handle *rec,
- const char *path, const char *prefix,
+ const char *path, const char **prefix_array,
char *line_buf, int pass, unsigned lineno)
{
int items, len;
@@ -313,12 +314,24 @@ static int process_line(struct selabel_handle *rec,
}
len = get_stem_from_spec(regex);
- if (len && prefix && strncmp(prefix, regex, len)) {
- /* Stem of regex does not match requested prefix, discard. */
- free(regex);
- free(type);
- free(context);
- return 0;
+ if (len && prefix_array[0]) {
+ int i = 0;
+ int found = 0;
+ while (i < MAX_PREFIX && prefix_array[i]) {
+ if (strncmp(prefix_array[i], regex, len) == 0) {
+ found = 1;
+ break;
+ }
+ i++;
+ }
+
+ if (! found) {
+ /* Stem of regex does not match requested prefix, discard. */
+ free(regex);
+ free(type);
+ free(context);
+ return 0;
+ }
}
if (pass == 1) {
@@ -400,7 +413,7 @@ 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,};
FILE *fp;
FILE *localfp = NULL;
FILE *homedirfp = NULL;
@@ -421,8 +434,19 @@ 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);
+ }
+ }
+
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)
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)
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)
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
--- a/libselinux/src/matchpathcon.c
+++ b/libselinux/src/matchpathcon.c
@@ -2,6 +2,7 @@
#include <string.h>
#include <errno.h>
#include <stdio.h>
+#include <syslog.h>
#include "selinux_internal.h"
#include "label_internal.h"
#include "callbacks.h"
@@ -62,7 +63,7 @@ static void
{
va_list ap;
va_start(ap, fmt);
- vfprintf(stderr, fmt, ap);
+ vsyslog(LOG_ERR, fmt, ap);
va_end(ap);
}
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