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Merge pull request #2262 from pohly/smack-network 

smack: Handling network
This commit is contained in:
Lennart Poettering 2016-01-11 17:30:15 +01:00
parent 00fd1ac59f ae176752f9
commit 81c5eb5b3d
1 changed files with 98 additions and 3 deletions
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101
src/core/smack-setup.c
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@ -197,6 +197,75 @@ static int write_cipso2_rules(const char* srcdir) {
return r;
}
static int write_netlabel_rules(const char* srcdir) {
_cleanup_fclose_ FILE *dst = NULL;
_cleanup_closedir_ DIR *dir = NULL;
struct dirent *entry;
char buf[NAME_MAX];
int dfd = -1;
int r = 0;
dst = fopen("/sys/fs/smackfs/netlabel", "we");
if (!dst) {
if (errno != ENOENT)
log_warning_errno(errno, "Failed to open /sys/fs/smackfs/netlabel: %m");
return -errno; /* negative error */
}
/* write rules to dst 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;
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);
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;
}
/* 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)) {
if (r == 0)
r = -EINVAL;
log_error_errno(errno, "Failed to write line to /sys/fs/smackfs/netlabel");
break;
}
if (fflush(dst)) {
if (r == 0)
r = -errno;
log_error_errno(errno, "Failed to flush writes to /sys/fs/smackfs/netlabel: %m");
break;
}
}
}
return r;
}
#endif
int mac_smack_setup(bool *loaded_policy) {
@ -225,8 +294,18 @@ int mac_smack_setup(bool *loaded_policy) {
#ifdef SMACK_RUN_LABEL
r = write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL, 0);
if (r)
log_warning_errno(r, "Failed to set SMACK label \"%s\" on self: %m", SMACK_RUN_LABEL);
if (r < 0)
log_warning_errno(r, "Failed to set SMACK label \"" SMACK_RUN_LABEL "\" on self: %m");
r = write_string_file("/sys/fs/smackfs/ambient", SMACK_RUN_LABEL, 0);
if (r < 0)
log_warning_errno(r, "Failed to set SMACK ambient label \"" SMACK_RUN_LABEL "\": %m");
r = write_string_file("/sys/fs/smackfs/netlabel",
"0.0.0.0/0 " SMACK_RUN_LABEL, 0);
if (r < 0)
log_warning_errno(r, "Failed to set SMACK netlabel rule \"0.0.0.0/0 " SMACK_RUN_LABEL "\": %m");
r = write_string_file("/sys/fs/smackfs/netlabel", "127.0.0.1 -CIPSO", 0);
if (r < 0)
log_warning_errno(r, "Failed to set SMACK netlabel rule \"127.0.0.1 -CIPSO\": %m");
#endif
r = write_cipso2_rules("/etc/smack/cipso.d/");
@ -236,13 +315,29 @@ int mac_smack_setup(bool *loaded_policy) {
return 0;
case ENOENT:
log_debug("Smack/CIPSO access rules directory '/etc/smack/cipso.d/' not found");
return 0;
break;
case 0:
log_info("Successfully loaded Smack/CIPSO policies.");
break;
default:
log_warning_errno(r, "Failed to load Smack/CIPSO access rules, ignoring: %m");
break;
}
r = write_netlabel_rules("/etc/smack/netlabel.d/");
switch(r) {
case -ENOENT:
log_debug("Smack/CIPSO is not enabled in the kernel.");
return 0;
case ENOENT:
log_debug("Smack network host rules directory '/etc/smack/netlabel.d/' not found");
break;
case 0:
log_info("Successfully loaded Smack network host rules.");
break;
default:
log_warning_errno(r, "Failed to load Smack network host rules: %m, ignoring.");
break;
}
*loaded_policy = true;