void
add_grlearn_acl(struct role_acl *role)
{
struct stat fstat;
struct ip_acl ip;
char *grlearn_path;
if (bikeshedding_detected())
grlearn_path = get_bikeshedded_path(GRLEARN_PATH);
else
grlearn_path = GRLEARN_PATH;
if (stat(grlearn_path, &fstat)) {
fprintf(stderr, "%s does not exist. Please reinstall gradm.\n", grlearn_path);
exit(EXIT_FAILURE);
}
add_proc_subject_acl(role, grlearn_path, proc_subject_mode_conv("hpado"), 0);
memset(&ip, 0, sizeof (ip));
add_ip_acl(current_subject, GR_IP_CONNECT, &ip);
add_ip_acl(current_subject, GR_IP_BIND, &ip);
ADD_OBJ("/", "h");
ADD_OBJ(grlearn_path, "x");
add_cap_acl(current_subject, "-CAP_ALL", NULL);
return;
}
void add_fulllearn_acl(void)
{
struct ip_acl ip;
add_kernel_acl();
add_fulllearn_admin_acl();
add_fulllearn_shutdown_acl();
add_role_acl(¤t_role, gr_strdup("default"), role_mode_conv("A"), 0);
add_role_transition(current_role, "admin");
add_role_transition(current_role, "shutdown");
add_proc_subject_acl(current_role, "/", proc_subject_mode_conv("ol"), 0);
ADD_OBJ("/", "h");
add_cap_acl(current_subject, "-CAP_ALL", NULL);
memset(&ip, 0, sizeof (ip));
add_ip_acl(current_subject, GR_IP_CONNECT, &ip);
add_ip_acl(current_subject, GR_IP_BIND, &ip);
add_gradm_acl(current_role);
parse_learn_config();
expand_acls();
return;
}
static void add_fulllearn_admin_acl(void)
{
add_role_acl(¤t_role, gr_strdup("admin"), role_mode_conv("sA"), 0);
add_proc_subject_acl(current_role, "/", proc_subject_mode_conv("aorvk"), 0);
ADD_OBJ("/", "rwcdmlxi");
return;
}
void
add_kernel_acl(void)
{
add_role_acl(¤t_role, gr_strdup(":::kernel:::"), role_mode_conv("sN"), 1);
add_proc_subject_acl(current_role, "/", proc_subject_mode_conv("kvo"), 0);
ADD_OBJ("/", "rwxcdl");
ADD_OBJ(GRSEC_DIR, "h");
return;
}
void add_rolelearn_acl(void)
{
struct ip_acl ip;
add_proc_subject_acl(current_role, "/", proc_subject_mode_conv("ol"), 0);
ADD_OBJ("/", "h");
add_cap_acl(current_subject, "-CAP_ALL", NULL);
memset(&ip, 0, sizeof (ip));
add_ip_acl(current_subject, GR_IP_CONNECT, &ip);
add_ip_acl(current_subject, GR_IP_BIND, &ip);
return;
}
static void add_fulllearn_shutdown_acl(void)
{
struct ip_acl ip;
add_role_acl(¤t_role, gr_strdup("shutdown"), role_mode_conv("sARG"), 0);
add_proc_subject_acl(current_role, "/", proc_subject_mode_conv("rvkao"), 0);
ADD_OBJ("/", "");
ADD_OBJ("/dev", "");
ADD_OBJ("/dev/urandom", "r");
ADD_OBJ("/dev/random", "r");
ADD_OBJ("/etc", "r");
ADD_OBJ("/bin", "rx");
ADD_OBJ("/sbin", "rx");
ADD_OBJ("/lib", "rx");
ADD_OBJ("/lib32", "rx");
ADD_OBJ("/lib64", "rx");
ADD_OBJ("/usr", "rx");
ADD_OBJ("/proc", "r");
ADD_OBJ("/boot", "h");
ADD_OBJ("/dev/grsec", "h");
ADD_OBJ("/dev/kmem", "h");
ADD_OBJ("/dev/mem", "h");
ADD_OBJ("/dev/port", "h");
ADD_OBJ("/etc/grsec", "h");
ADD_OBJ("/proc/kcore", "h");
ADD_OBJ("/proc/slabinfo", "h");
ADD_OBJ("/proc/modules", "h");
ADD_OBJ("/proc/kallsyms", "h");
ADD_OBJ("/lib/modules", "hs");
ADD_OBJ("/lib32/modules", "hs");
ADD_OBJ("/lib64/modules", "hs");
ADD_OBJ("/etc/ssh", "h");
add_cap_acl(current_subject, "-CAP_ALL", NULL);
memset(&ip, 0, sizeof (ip));
add_ip_acl(current_subject, GR_IP_CONNECT, &ip);
add_ip_acl(current_subject, GR_IP_BIND, &ip);
return;
}
void
add_gradm_acl(struct role_acl *role)
{
struct stat fstat;
char gradm_realpath[PATH_MAX] = { 0 };
char *gradm_name;
struct ip_acl ip;
struct protoent *proto;
char *gradm_path;
char *grpam_path;
find_gradm_path(gradm_realpath);
gradm_name = gr_strdup(gradm_realpath);
if (bikeshedding_detected()) {
gradm_path = get_bikeshedded_path(GRADM_PATH);
grpam_path = get_bikeshedded_path(GRPAM_PATH);
} else {
gradm_path = GRADM_PATH;
grpam_path = GRPAM_PATH;
}
if (gr_enable && strcmp(gradm_name, gradm_path)) {
printf("You are attempting to use a gradm binary other "
"than the installed version. Depending on your "
"policy, you could be locking yourself out of "
"your machine by enabling the RBAC system with "
"this binary. Press \'y\' if you wish to ignore "
"this warning, or any other key to cancel.\n>");
if (getchar() != 'y')
exit(EXIT_FAILURE);
}
add_proc_subject_acl(role, gradm_name, proc_subject_mode_conv("ado"), 0);
if (!stat(GRDEV_PATH, &fstat)) {
ADD_OBJ(GRDEV_PATH, "w");
} else {
fprintf(stderr, "%s does not "
"exist. Please recompile your kernel with "
"grsecurity and install a newer version of gradm.\n",
GRDEV_PATH);
exit(EXIT_FAILURE);
}
/* for NFS */
proto = gr_getprotobyname("udp");
memset(&ip, 0, sizeof (ip));
ip.low = 2049;
ip.high = 2049;
ip.type = (1U << SOCK_DGRAM);
ip.proto[IPPROTO_IP / 32] |= (1U << (IPPROTO_IP % 32));
ip.proto[proto->p_proto / 32] |= (1U << (proto->p_proto % 32));
add_ip_acl(current_subject, GR_IP_CONNECT, &ip);
memset(&ip, 0, sizeof (ip));
add_ip_acl(current_subject, GR_IP_BIND, &ip);
ADD_OBJ("/", "h");
ADD_OBJ("/etc/ld.so.cache", "r");
ADD_OBJ("/etc/ld.so.preload", "r");
ADD_OBJ("/etc/ld.so.nohwcap", "r");
ADD_OBJ("/etc/protocols", "r");
ADD_OBJ("/dev/urandom", "r");
ADD_OBJ("/lib", "rx");
ADD_OBJ("/usr/lib", "rx");
ADD_OBJ("/lib32", "rx");
ADD_OBJ("/libx32", "rx");
ADD_OBJ("/usr/lib32", "rx");
ADD_OBJ("/usr/libx32", "rx");
ADD_OBJ("/lib64", "rx");
ADD_OBJ("/usr/lib64", "rx");
ADD_OBJ(gradm_name, "x");
ADD_OBJ(grpam_path, "x");
add_cap_acl(current_subject, "-CAP_ALL", NULL);
add_cap_acl(current_subject, "+CAP_IPC_LOCK", NULL);
return;
}
void
add_gradm_pam_acl(struct role_acl *role)
{
struct ip_acl ip;
struct protoent *proto;
char *grpam_path;
if (bikeshedding_detected())
grpam_path = get_bikeshedded_path(GRPAM_PATH);
else
grpam_path = GRPAM_PATH;
add_proc_subject_acl(role, grpam_path, proc_subject_mode_conv("ado"), 0);
ADD_OBJ(GRDEV_PATH, "w");
/* for NFS */
proto = gr_getprotobyname("udp");
memset(&ip, 0, sizeof (ip));
ip.low = 2049;
ip.high = 2049;
ip.type = (1U << SOCK_DGRAM);
ip.proto[IPPROTO_IP / 32] |= (1U << (IPPROTO_IP % 32));
ip.proto[proto->p_proto / 32] |= (1U << (proto->p_proto % 32));
add_ip_acl(current_subject, GR_IP_CONNECT, &ip);
/* for TCP/UDP LDAP */
proto = gr_getprotobyname("tcp");
memset(&ip, 0, sizeof (ip));
ip.low = 389;
ip.high = 389;
ip.type = (1U << SOCK_STREAM);
ip.proto[IPPROTO_IP / 32] |= (1U << (IPPROTO_IP % 32));
ip.proto[proto->p_proto / 32] |= (1U << (proto->p_proto % 32));
add_ip_acl(current_subject, GR_IP_CONNECT, &ip);
proto = gr_getprotobyname("udp");
memset(&ip, 0, sizeof (ip));
ip.low = 389;
ip.high = 389;
ip.type = (1U << SOCK_DGRAM);
ip.proto[IPPROTO_IP / 32] |= (1U << (IPPROTO_IP % 32));
ip.proto[proto->p_proto / 32] |= (1U << (proto->p_proto % 32));
add_ip_acl(current_subject, GR_IP_CONNECT, &ip);
/* for TCP SSL LDAP */
proto = gr_getprotobyname("tcp");
memset(&ip, 0, sizeof (ip));
ip.low = 636;
ip.high = 636;
ip.type = (1U << SOCK_STREAM);
ip.proto[IPPROTO_IP / 32] |= (1U << (IPPROTO_IP % 32));
ip.proto[proto->p_proto / 32] |= (1U << (proto->p_proto % 32));
add_ip_acl(current_subject, GR_IP_CONNECT, &ip);
/* no binding allowed */
memset(&ip, 0, sizeof (ip));
add_ip_acl(current_subject, GR_IP_BIND, &ip);
ADD_OBJ("/", "h");
ADD_OBJ("/etc/default/passwd", "r");
ADD_OBJ("/etc/ld.so.cache", "r");
ADD_OBJ("/etc/ld.so.preload", "r");
ADD_OBJ("/etc/ld.so.nohwcap", "r");
ADD_OBJ("/etc/localtime", "r");
ADD_OBJ("/etc/login.defs", "r");
ADD_OBJ("/etc/protocols", "r");
ADD_OBJ("/etc/passwd", "r");
ADD_OBJ("/etc/shadow", "r");
ADD_OBJ("/etc/pam.d", "r");
ADD_OBJ("/etc/pam.conf", "r");
ADD_OBJ("/etc/security", "r");
ADD_OBJ("/usr/share/zoneinfo", "r");
ADD_OBJ("/etc/nsswitch.conf", "r");
ADD_OBJ("/etc/ldap.conf", "r");
ADD_OBJ("/etc/ldap/ldap.conf", "r");
ADD_OBJ("/dev/urandom", "r");
ADD_OBJ("/proc", "");
ADD_OBJ("/proc/filesystems", "r");
ADD_OBJ("/selinux", "r");
ADD_OBJ("/dev", "");
ADD_OBJ("/dev/tty", "rw");
ADD_OBJ("/dev/tty?", "rw");
ADD_OBJ("/dev/pts", "rw");
ADD_OBJ("/var/run", "");
ADD_OBJ("/run", "");
ADD_OBJ("/run/resolvconf/resolv.conf", "r");
ADD_OBJ("/run/nscd/socket", "rw");
ADD_OBJ("/var/run/utmp", "rw");
ADD_OBJ("/var/run/utmpx", "rw");
ADD_OBJ("/var/log/faillog", "rw");
ADD_OBJ("/dev/log", "rw");
ADD_OBJ("/run/systemd/journal/dev-log", "rw");
ADD_OBJ("/dev/null", "rw");
ADD_OBJ("/lib", "rx");
ADD_OBJ("/usr/lib", "rx");
ADD_OBJ("/lib32", "rx");
ADD_OBJ("/usr/lib32", "rx");
ADD_OBJ("/lib64", "rx");
ADD_OBJ("/usr/lib64", "rx");
ADD_OBJ(grpam_path, "x");
add_cap_acl(current_subject, "-CAP_ALL", NULL);
add_cap_acl(current_subject, "+CAP_IPC_LOCK", NULL);
add_cap_acl(current_subject, "+CAP_AUDIT_WRITE", NULL);
add_sock_family(current_subject, "netlink");
return;
}
void
add_proc_nested_acl(struct role_acl *role, char *mainsubjname,
char **nestednames, int nestlen, u_int32_t nestmode)
{
int i;
char *nestname;
unsigned int namelen = 0;
struct proc_acl *stmp;
struct file_acl *otmp = NULL;
struct stat fstat;
if (nestmode & GR_LEARN) {
fprintf(stderr, "Error on line %lu of %s:\n", lineno,
current_acl_file);
fprintf(stderr,
"Learning is not yet implemented for nested subjects.\n");
exit(EXIT_FAILURE);
}
namelen += strlen(mainsubjname);
for (i = 0; i < nestlen; i++)
namelen += strlen(nestednames[i]) + 1;
nestname = malloc(namelen + 1);
if (!nestname) {
fprintf(stderr, "Out of memory.\n");
exit(EXIT_FAILURE);
}
strcpy(nestname, mainsubjname);
for (i = 0; i < nestlen; i++)
sprintf(nestname + strlen(nestname), ":%s", nestednames[i]);
stmp = lookup_acl_subject_by_name(role, mainsubjname);
if (stmp == NULL) {
fprintf(stderr,
"No subject %s found for nested subject %s specified on line %lu of %s.\n",
mainsubjname, nestname, lineno, current_acl_file);
exit(EXIT_FAILURE);
}
for (i = 0; i < nestlen; i++) {
otmp = lookup_acl_object_by_name(stmp, nestednames[i]);
if (otmp == NULL) {
fprintf(stderr,
"No object %s found for nested subject %s "
"specified on line %lu of %s.\n",
nestednames[i], nestname, lineno,
current_acl_file);
exit(EXIT_FAILURE);
} else if (!otmp->nested && (i != nestlen - 1)) {
fprintf(stderr,
"No nested subject %s found for nested "
"subject %s specified on line %lu of %s.\n",
nestednames[i], nestname, lineno,
current_acl_file);
exit(EXIT_FAILURE);
} else if (otmp->nested && (i == nestlen - 1)) {
fprintf(stderr,
"Duplicate nested subject %s found on line "
"%lu of %s.\n",
nestname, lineno, current_acl_file);
exit(EXIT_FAILURE);
}
if (i != nestlen - 1)
stmp = otmp->nested;
}
add_proc_subject_acl(role, nestednames[i - 1], nestmode, GR_FFAKE);
namelen = strlen(nestednames[i-1]);
for_each_object(otmp, stmp) {
if (!strncmp(nestednames[i-1], otmp->filename, namelen) && (otmp->filename[namelen] == '/' || otmp->filename[namelen] == '\0'))
if (otmp->mode & GR_EXEC)
otmp->nested = current_subject;
}
current_subject->parent_subject = stmp;
current_subject->mode |= GR_NESTED;
if (!stat(nestednames[i - 1], &fstat) && S_ISREG(fstat.st_mode))
add_proc_object_acl(current_subject, nestednames[i - 1], proc_object_mode_conv("rx"), GR_FLEARN);
return;
}
