* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
+#define _GNU_SOURCE /* crypt() */
+
#include <libubox/avl-cmp.h>
+#include <libubox/blobmsg.h>
#include <libubox/utils.h>
#include <libubus.h>
#include <fnmatch.h>
+#include <glob.h>
+#include <uci.h>
+
+#ifdef HAVE_SHADOW
+#include <shadow.h>
+#endif
#include <rpcd/session.h>
[RPC_DUMP_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
};
+enum {
+ RPC_L_USERNAME,
+ RPC_L_PASSWORD,
+ RPC_L_TIMEOUT,
+ __RPC_L_MAX,
+};
+static const struct blobmsg_policy login_policy[__RPC_L_MAX] = {
+ [RPC_L_USERNAME] = { .name = "username", .type = BLOBMSG_TYPE_STRING },
+ [RPC_L_PASSWORD] = { .name = "password", .type = BLOBMSG_TYPE_STRING },
+ [RPC_L_TIMEOUT] = { .name = "timeout", .type = BLOBMSG_TYPE_INT32 },
+};
+
/*
* Keys in the AVL tree contain all pattern characters up to the first wildcard.
* To look up entries, start with the last entry that has a key less than or
static void
rpc_touch_session(struct rpc_session *ses)
{
- uloop_timeout_set(&ses->t, ses->timeout * 1000);
+ if (ses->timeout > 0)
+ uloop_timeout_set(&ses->t, ses->timeout * 1000);
}
static void
static bool
+rpc_login_test_password(const char *hash, const char *password)
+{
+ char *crypt_hash;
+
+ /* password is not set */
+ if (!hash || !*hash || !strcmp(hash, "!") || !strcmp(hash, "x"))
+ {
+ return true;
+ }
+
+ /* password hash refers to shadow/passwd */
+ else if (!strncmp(hash, "$p$", 3))
+ {
+#ifdef HAVE_SHADOW
+ struct spwd *sp = getspnam(hash + 3);
+
+ if (!sp)
+ return false;
+
+ return rpc_login_test_password(sp->sp_pwdp, password);
+#else
+ struct passwd *pw = getpwnam(hash + 3);
+
+ if (!pw)
+ return false;
+
+ return rpc_login_test_password(pw->pw_passwd, password);
+#endif
+ }
+
+ crypt_hash = crypt(hash, password);
+
+ return !strcmp(crypt_hash, hash);
+}
+
+static struct uci_section *
+rpc_login_test_login(struct uci_context *uci,
+ const char *username, const char *password)
+{
+ struct uci_package *p;
+ struct uci_section *s;
+ struct uci_element *e;
+ struct uci_ptr ptr = { .package = "rpcd" };
+
+ uci_load(uci, ptr.package, &p);
+
+ if (!p)
+ return false;
+
+ uci_foreach_element(&p->sections, e)
+ {
+ s = uci_to_section(e);
+
+ if (strcmp(s->type, "login"))
+ continue;
+
+ ptr.section = s->e.name;
+ ptr.s = NULL;
+
+ /* test for matching username */
+ ptr.option = "username";
+ ptr.o = NULL;
+
+ if (uci_lookup_ptr(uci, &ptr, NULL, true))
+ continue;
+
+ if (ptr.o->type != UCI_TYPE_STRING)
+ continue;
+
+ if (strcmp(ptr.o->v.string, username))
+ continue;
+
+ /* test for matching password */
+ ptr.option = "password";
+ ptr.o = NULL;
+
+ if (uci_lookup_ptr(uci, &ptr, NULL, true))
+ continue;
+
+ if (ptr.o->type != UCI_TYPE_STRING)
+ continue;
+
+ if (rpc_login_test_password(ptr.o->v.string, password))
+ return ptr.s;
+ }
+
+ return NULL;
+}
+
+static bool
+rpc_login_test_permission(struct uci_section *s,
+ const char *perm, const char *group)
+{
+ struct uci_option *o;
+ struct uci_element *e, *l;
+
+ /* If the login section is not provided, we're setting up acls for the
+ * default session, in this case uncondionally allow access to the
+ * "unauthenticated" access group */
+ if (!s) {
+ return !strcmp(group, "unauthenticated");
+ }
+
+ uci_foreach_element(&s->options, e)
+ {
+ o = uci_to_option(e);
+
+ if (o->type != UCI_TYPE_LIST)
+ continue;
+
+ if (strcmp(o->e.name, perm))
+ continue;
+
+ uci_foreach_element(&o->v.list, l)
+ if (l->name && !fnmatch(l->name, group, 0))
+ return true;
+ }
+
+ /* make sure that write permission implies read permission */
+ if (!strcmp(perm, "read"))
+ return rpc_login_test_permission(s, "write", group);
+
+ return false;
+}
+
+static void
+rpc_login_setup_acl_scope(struct rpc_session *ses,
+ struct blob_attr *acl_perm,
+ struct blob_attr *acl_scope)
+{
+ struct blob_attr *acl_obj, *acl_func;
+ int rem, rem2;
+
+ /*
+ * Parse ACL scopes in table notation.
+ *
+ * "<scope>": {
+ * "<object>": [
+ * "<function>",
+ * "<function>",
+ * ...
+ * ]
+ * }
+ */
+ if (blob_id(acl_scope) == BLOBMSG_TYPE_TABLE) {
+ blobmsg_for_each_attr(acl_obj, acl_scope, rem) {
+ if (blob_id(acl_obj) != BLOBMSG_TYPE_ARRAY)
+ continue;
+
+ blobmsg_for_each_attr(acl_func, acl_obj, rem2) {
+ if (blob_id(acl_func) != BLOBMSG_TYPE_STRING)
+ continue;
+
+ rpc_session_grant(ses, NULL, blobmsg_name(acl_scope),
+ blobmsg_name(acl_obj),
+ blobmsg_data(acl_func));
+ }
+ }
+ }
+
+ /*
+ * Parse ACL scopes in array notation. The permission ("read" or "write")
+ * will be used as function name for each object.
+ *
+ * "<scope>": [
+ * "<object>",
+ * "<object>",
+ * ...
+ * ]
+ */
+ else if (blob_id(acl_scope) == BLOBMSG_TYPE_ARRAY) {
+ blobmsg_for_each_attr(acl_obj, acl_scope, rem) {
+ if (blob_id(acl_obj) != BLOBMSG_TYPE_STRING)
+ continue;
+
+ rpc_session_grant(ses, NULL, blobmsg_name(acl_scope),
+ blobmsg_data(acl_obj),
+ blobmsg_name(acl_perm));
+ }
+ }
+}
+
+static void
+rpc_login_setup_acl_file(struct rpc_session *ses, struct uci_section *login,
+ const char *path)
+{
+ struct blob_buf acl = { 0 };
+ struct blob_attr *acl_group, *acl_perm, *acl_scope;
+ int rem, rem2, rem3;
+
+ blob_buf_init(&acl, 0);
+
+ if (!blobmsg_add_json_from_file(&acl, path)) {
+ fprintf(stderr, "Failed to parse %s\n", path);
+ goto out;
+ }
+
+ /* Iterate access groups in toplevel object */
+ blob_for_each_attr(acl_group, acl.head, rem) {
+ /* Iterate permission objects in each access group object */
+ blobmsg_for_each_attr(acl_perm, acl_group, rem2) {
+ if (blob_id(acl_perm) != BLOBMSG_TYPE_TABLE)
+ continue;
+
+ /* Only "read" and "write" permissions are defined */
+ if (strcmp(blobmsg_name(acl_perm), "read") &&
+ strcmp(blobmsg_name(acl_perm), "write"))
+ continue;
+
+ /*
+ * Check if the current user context specifies the current
+ * "read" or "write" permission in the given access group.
+ */
+ if (!rpc_login_test_permission(login, blobmsg_name(acl_perm),
+ blobmsg_name(acl_group)))
+ continue;
+
+ /* Iterate scope objects within the permission object */
+ blobmsg_for_each_attr(acl_scope, acl_perm, rem3) {
+ /* Setup the scopes of the access group */
+ rpc_login_setup_acl_scope(ses, acl_perm, acl_scope);
+
+ /*
+ * Add the access group itself as object to the "access-group"
+ * meta scope and the the permission level ("read" or "write")
+ * as function, so
+ * "<group>": {
+ * "<permission>": {
+ * "<scope>": ...
+ * }
+ * }
+ * becomes
+ * "access-group": {
+ * "<group>": [
+ * "<permission>"
+ * ]
+ * }
+ *
+ * This allows session clients to easily query the allowed
+ * access groups without having to test access of each single
+ * <scope>/<object>/<function> tuple defined in a group.
+ */
+ rpc_session_grant(ses, NULL, "access-group",
+ blobmsg_name(acl_group),
+ blobmsg_name(acl_perm));
+ }
+ }
+ }
+
+out:
+ blob_buf_free(&acl);
+}
+
+static void
+rpc_login_setup_acls(struct rpc_session *ses, struct uci_section *login)
+{
+ int i;
+ glob_t gl;
+
+ if (glob(RPC_SESSION_ACL_DIR "/*.json", 0, NULL, &gl))
+ return;
+
+ for (i = 0; i < gl.gl_pathc; i++)
+ rpc_login_setup_acl_file(ses, login, gl.gl_pathv[i]);
+
+ globfree(&gl);
+}
+
+static int
+rpc_handle_login(struct ubus_context *ctx, struct ubus_object *obj,
+ struct ubus_request_data *req, const char *method,
+ struct blob_attr *msg)
+{
+ struct uci_context *uci = NULL;
+ struct uci_section *login;
+ struct rpc_session *ses;
+ struct blob_attr *tb[__RPC_L_MAX];
+ int timeout = RPC_DEFAULT_SESSION_TIMEOUT;
+ int rv = 0;
+
+ blobmsg_parse(acl_policy, __RPC_L_MAX, tb, blob_data(msg), blob_len(msg));
+
+ if (!tb[RPC_L_USERNAME] || !tb[RPC_L_PASSWORD]) {
+ rv = UBUS_STATUS_INVALID_ARGUMENT;
+ goto out;
+ }
+
+ uci = uci_alloc_context();
+
+ if (!uci) {
+ rv = UBUS_STATUS_UNKNOWN_ERROR;
+ goto out;
+ }
+
+ login = rpc_login_test_login(uci, blobmsg_get_string(tb[RPC_L_USERNAME]),
+ blobmsg_get_string(tb[RPC_L_PASSWORD]));
+
+ if (!login) {
+ rv = UBUS_STATUS_PERMISSION_DENIED;
+ goto out;
+ }
+
+ if (tb[RPC_L_TIMEOUT])
+ timeout = blobmsg_get_u32(tb[RPC_L_TIMEOUT]);
+
+ ses = rpc_session_create(timeout);
+
+ if (!ses) {
+ rv = UBUS_STATUS_UNKNOWN_ERROR;
+ goto out;
+ }
+
+ rpc_login_setup_acls(ses, login);
+
+ rpc_session_set(ses, "user", tb[RPC_L_USERNAME]);
+ rpc_session_dump(ses, ctx, req);
+
+out:
+ if (uci)
+ uci_free_context(uci);
+
+ return rv;
+}
+
+
+static bool
rpc_validate_sid(const char *id)
{
if (!id)
int rpc_session_api_init(struct ubus_context *ctx)
{
+ struct rpc_session *ses;
+
static const struct ubus_method session_methods[] = {
UBUS_METHOD("create", rpc_handle_create, &new_policy),
UBUS_METHOD("list", rpc_handle_list, &sid_policy),
UBUS_METHOD("get", rpc_handle_get, get_policy),
UBUS_METHOD("unset", rpc_handle_unset, get_policy),
UBUS_METHOD("destroy", rpc_handle_destroy, &sid_policy),
+ UBUS_METHOD("login", rpc_handle_login, login_policy),
};
static struct ubus_object_type session_type =
avl_init(&sessions, avl_strcmp, false, NULL);
+ /* setup the default session */
+ ses = rpc_session_new();
+
+ if (ses) {
+ strcpy(ses->id, RPC_DEFAULT_SESSION_ID);
+ rpc_login_setup_acls(ses, NULL);
+ avl_insert(&sessions, &ses->avl);
+ }
+
return ubus_add_object(ctx, &obj);
}
mkdir(RPC_SESSION_DIRECTORY, 0700);
avl_for_each_element(&sessions, ses, avl) {
+ /* skip default session */
+ if (!strcmp(ses->id, RPC_DEFAULT_SESSION_ID))
+ continue;
+
snprintf(path, sizeof(path) - 1, RPC_SESSION_DIRECTORY "/%s", ses->id);
rpc_session_to_blob(ses);
rpc_blob_to_file(path, buf.head);
projects / project / rpcd.git / commitdiff