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-rw-r--r--src/core/smack-setup.c135
1 files changed, 110 insertions, 25 deletions
diff --git a/src/core/smack-setup.c b/src/core/smack-setup.c
index ff2a02004d..ddb02a1580 100644
--- a/src/core/smack-setup.c
+++ b/src/core/smack-setup.c
@@ -34,31 +34,35 @@
#include "fileio.h"
#include "log.h"
-#define SMACK_CONFIG "/etc/smack/accesses.d/"
-#define CIPSO_CONFIG "/etc/smack/cipso.d/"
-
#ifdef HAVE_SMACK
-static int write_rules(const char* dstpath, const char* srcdir) {
- _cleanup_fclose_ FILE *dst = NULL;
+static int write_access2_rules(const char* srcdir) {
+ _cleanup_close_ int load2_fd = -1, change_fd = -1;
_cleanup_closedir_ DIR *dir = NULL;
struct dirent *entry;
char buf[NAME_MAX];
int dfd = -1;
int r = 0;
- dst = fopen(dstpath, "we");
- if (!dst) {
+ load2_fd = open("/sys/fs/smackfs/load2", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
+ if (load2_fd < 0) {
+ if (errno != ENOENT)
+ log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/load2': %m");
+ return -errno; /* negative error */
+ }
+
+ change_fd = open("/sys/fs/smackfs/change-rule", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
+ if (change_fd < 0) {
if (errno != ENOENT)
- log_warning_errno(errno, "Failed to open %s: %m", dstpath);
+ log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/change-rule': %m");
return -errno; /* negative error */
}
- /* write rules to dst from every file in the directory */
+ /* write rules to load2 or change-rule from every file in the directory */
dir = opendir(srcdir);
if (!dir) {
if (errno != ENOENT)
- log_warning_errno(errno, "Failed to opendir %s: %m", srcdir);
+ log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
return errno; /* positive on purpose */
}
@@ -69,11 +73,14 @@ static int write_rules(const char* dstpath, const char* srcdir) {
int fd;
_cleanup_fclose_ FILE *policy = NULL;
+ if (!dirent_is_file(entry))
+ continue;
+
fd = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC);
if (fd < 0) {
if (r == 0)
r = -errno;
- log_warning_errno(errno, "Failed to open %s: %m", entry->d_name);
+ log_warning_errno(errno, "Failed to open '%s': %m", entry->d_name);
continue;
}
@@ -82,30 +89,108 @@ static int write_rules(const char* dstpath, const char* srcdir) {
if (r == 0)
r = -errno;
safe_close(fd);
- log_error_errno(errno, "Failed to open %s: %m", entry->d_name);
+ log_error_errno(errno, "Failed to open '%s': %m", entry->d_name);
continue;
}
/* load2 write rules in the kernel require a line buffered stream */
FOREACH_LINE(buf, policy,
- log_error_errno(errno, "Failed to read line from %s: %m",
- entry->d_name)) {
- if (!fputs(buf, dst)) {
+ log_error_errno(errno, "Failed to read line from '%s': %m",
+ entry->d_name)) {
+
+ _cleanup_free_ char *sbj = NULL, *obj = NULL, *acc1 = NULL, *acc2 = NULL;
+
+ if (isempty(truncate_nl(buf)))
+ continue;
+
+ /* if 3 args -> load rule : subject object access1 */
+ /* if 4 args -> change rule : subject object access1 access2 */
+ if (sscanf(buf, "%ms %ms %ms %ms", &sbj, &obj, &acc1, &acc2) < 3) {
+ log_error_errno(errno, "Failed to parse rule '%s' in '%s', ignoring.", buf, entry->d_name);
+ continue;
+ }
+
+ if (write(isempty(acc2) ? load2_fd : change_fd, buf, strlen(buf)) < 0) {
if (r == 0)
- r = -EINVAL;
- log_error("Failed to write line to %s", dstpath);
- break;
+ r = -errno;
+ log_error_errno(errno, "Failed to write '%s' to '%s' in '%s'",
+ buf, isempty(acc2) ? "/sys/fs/smackfs/load2" : "/sys/fs/smackfs/change-rule", entry->d_name);
}
- if (fflush(dst)) {
+ }
+ }
+
+ return r;
+}
+
+static int write_cipso2_rules(const char* srcdir) {
+ _cleanup_close_ int cipso2_fd = -1;
+ _cleanup_closedir_ DIR *dir = NULL;
+ struct dirent *entry;
+ char buf[NAME_MAX];
+ int dfd = -1;
+ int r = 0;
+
+ cipso2_fd = open("/sys/fs/smackfs/cipso2", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
+ if (cipso2_fd < 0) {
+ if (errno != ENOENT)
+ log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/cipso2': %m");
+ return -errno; /* negative error */
+ }
+
+ /* write rules to cipso2 from every file in the directory */
+ dir = opendir(srcdir);
+ if (!dir) {
+ if (errno != ENOENT)
+ log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
+ return errno; /* positive on purpose */
+ }
+
+ dfd = dirfd(dir);
+ assert(dfd >= 0);
+
+ FOREACH_DIRENT(entry, dir, return 0) {
+ int fd;
+ _cleanup_fclose_ FILE *policy = NULL;
+
+ if (!dirent_is_file(entry))
+ continue;
+
+ fd = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC);
+ if (fd < 0) {
+ if (r == 0)
+ r = -errno;
+ log_error_errno(errno, "Failed to open '%s': %m", entry->d_name);
+ continue;
+ }
+
+ policy = fdopen(fd, "re");
+ if (!policy) {
+ if (r == 0)
+ r = -errno;
+ safe_close(fd);
+ log_error_errno(errno, "Failed to open '%s': %m", entry->d_name);
+ continue;
+ }
+
+ /* cipso2 write rules in the kernel require a line buffered stream */
+ FOREACH_LINE(buf, policy,
+ log_error_errno(errno, "Failed to read line from '%s': %m",
+ entry->d_name)) {
+
+ if (isempty(truncate_nl(buf)))
+ continue;
+
+ if (write(cipso2_fd, buf, strlen(buf)) < 0) {
if (r == 0)
r = -errno;
- log_error_errno(errno, "Failed to flush writes to %s: %m", dstpath);
+ log_error_errno(errno, "Failed to write '%s' to '/sys/fs/smackfs/cipso2' in '%s'",
+ buf, entry->d_name);
break;
}
}
}
- return r;
+ return r;
}
#endif
@@ -118,13 +203,13 @@ int mac_smack_setup(bool *loaded_policy) {
assert(loaded_policy);
- r = write_rules("/sys/fs/smackfs/load2", SMACK_CONFIG);
+ r = write_access2_rules("/etc/smack/accesses.d/");
switch(r) {
case -ENOENT:
log_debug("Smack is not enabled in the kernel.");
return 0;
case ENOENT:
- log_debug("Smack access rules directory " SMACK_CONFIG " not found");
+ log_debug("Smack access rules directory '/etc/smack/accesses.d/' not found");
return 0;
case 0:
log_info("Successfully loaded Smack policies.");
@@ -142,13 +227,13 @@ int mac_smack_setup(bool *loaded_policy) {
SMACK_RUN_LABEL, strerror(-r));
#endif
- r = write_rules("/sys/fs/smackfs/cipso2", CIPSO_CONFIG);
+ r = write_cipso2_rules("/etc/smack/cipso.d/");
switch(r) {
case -ENOENT:
log_debug("Smack/CIPSO is not enabled in the kernel.");
return 0;
case ENOENT:
- log_debug("Smack/CIPSO access rules directory " CIPSO_CONFIG " not found");
+ log_debug("Smack/CIPSO access rules directory '/etc/smack/cipso.d/' not found");
return 0;
case 0:
log_info("Successfully loaded Smack/CIPSO policies.");
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-03 05:39:38 +0000