diff options
Diffstat (limited to 'ubus.c')
| -rw-r--r-- | ubus.c | 585 |
1 files changed, 6 insertions, 579 deletions
@@ -22,560 +22,21 @@ #include <libubox/blobmsg_json.h> #include <libubox/avl.h> #include <libubox/avl-cmp.h> -#include <fnmatch.h> #include <stdio.h> #include <poll.h> #include "uhttpd.h" #include "plugin.h" -#include "ubus.h" +#include "ubus-session.h" static const struct uhttpd_ops *ops; static struct config *_conf; #define conf (*_conf) static struct ubus_context *ctx; -static struct avl_tree sessions; static struct blob_buf buf; -static const struct blobmsg_policy new_policy = { - .name = "timeout", .type = BLOBMSG_TYPE_INT32 -}; - -static const struct blobmsg_policy sid_policy = { - .name = "sid", .type = BLOBMSG_TYPE_STRING -}; - -enum { - UH_UBUS_SS_SID, - UH_UBUS_SS_VALUES, - __UH_UBUS_SS_MAX, -}; -static const struct blobmsg_policy set_policy[__UH_UBUS_SS_MAX] = { - [UH_UBUS_SS_SID] = { .name = "sid", .type = BLOBMSG_TYPE_STRING }, - [UH_UBUS_SS_VALUES] = { .name = "values", .type = BLOBMSG_TYPE_TABLE }, -}; - -enum { - UH_UBUS_SG_SID, - UH_UBUS_SG_KEYS, - __UH_UBUS_SG_MAX, -}; -static const struct blobmsg_policy get_policy[__UH_UBUS_SG_MAX] = { - [UH_UBUS_SG_SID] = { .name = "sid", .type = BLOBMSG_TYPE_STRING }, - [UH_UBUS_SG_KEYS] = { .name = "keys", .type = BLOBMSG_TYPE_ARRAY }, -}; - -enum { - UH_UBUS_SA_SID, - UH_UBUS_SA_OBJECTS, - __UH_UBUS_SA_MAX, -}; -static const struct blobmsg_policy acl_policy[__UH_UBUS_SA_MAX] = { - [UH_UBUS_SA_SID] = { .name = "sid", .type = BLOBMSG_TYPE_STRING }, - [UH_UBUS_SA_OBJECTS] = { .name = "objects", .type = BLOBMSG_TYPE_ARRAY }, -}; - -/* - * 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 - * equal to the method name, then work backwards as long as the AVL key still - * matches its counterpart in the object name - */ -#define uh_foreach_matching_acl_prefix(_acl, _ses, _obj, _func) \ - for (_acl = avl_find_le_element(&(_ses)->acls, _obj, _acl, avl); \ - _acl; \ - _acl = avl_is_first(&(ses)->acls, &(_acl)->avl) ? NULL : \ - avl_prev_element((_acl), avl)) - -#define uh_foreach_matching_acl(_acl, _ses, _obj, _func) \ - uh_foreach_matching_acl_prefix(_acl, _ses, _obj, _func) \ - if (!strncmp((_acl)->object, _obj, (_acl)->sort_len) && \ - !fnmatch((_acl)->object, (_obj), FNM_NOESCAPE) && \ - !fnmatch((_acl)->function, (_func), FNM_NOESCAPE)) - -static void -uh_ubus_random(char *dest) -{ - unsigned char buf[16] = { 0 }; - FILE *f; - int i; - - f = fopen("/dev/urandom", "r"); - if (!f) - return; - - fread(buf, 1, sizeof(buf), f); - fclose(f); - - for (i = 0; i < sizeof(buf); i++) - sprintf(dest + (i<<1), "%02x", buf[i]); -} - -static void -uh_ubus_session_dump_data(struct uh_ubus_session *ses, struct blob_buf *b) -{ - struct uh_ubus_session_data *d; - - avl_for_each_element(&ses->data, d, avl) { - blobmsg_add_field(b, blobmsg_type(d->attr), blobmsg_name(d->attr), - blobmsg_data(d->attr), blobmsg_data_len(d->attr)); - } -} - -static void -uh_ubus_session_dump_acls(struct uh_ubus_session *ses, struct blob_buf *b) -{ - struct uh_ubus_session_acl *acl; - const char *lastobj = NULL; - void *c = NULL; - - avl_for_each_element(&ses->acls, acl, avl) { - if (!lastobj || strcmp(acl->object, lastobj)) - { - if (c) blobmsg_close_array(b, c); - c = blobmsg_open_array(b, acl->object); - } - - blobmsg_add_string(b, NULL, acl->function); - lastobj = acl->object; - } - - if (c) blobmsg_close_array(b, c); -} - -static void -uh_ubus_session_dump(struct uh_ubus_session *ses, - struct ubus_context *ctx, - struct ubus_request_data *req) -{ - void *c; - struct blob_buf b; - - memset(&b, 0, sizeof(b)); - blob_buf_init(&b, 0); - - blobmsg_add_string(&b, "sid", ses->id); - blobmsg_add_u32(&b, "timeout", ses->timeout); - - c = blobmsg_open_table(&b, "acls"); - uh_ubus_session_dump_acls(ses, &b); - blobmsg_close_table(&b, c); - - c = blobmsg_open_table(&b, "data"); - uh_ubus_session_dump_data(ses, &b); - blobmsg_close_table(&b, c); - - ubus_send_reply(ctx, req, b.head); - blob_buf_free(&b); -} - -static void -uh_ubus_touch_session(struct uh_ubus_session *ses) -{ - uloop_timeout_set(&ses->t, ses->timeout * 1000); -} - -static void -uh_ubus_session_destroy(struct uh_ubus_session *ses) -{ - struct uh_ubus_session_acl *acl, *nacl; - struct uh_ubus_session_data *data, *ndata; - - uloop_timeout_cancel(&ses->t); - avl_remove_all_elements(&ses->acls, acl, avl, nacl) - free(acl); - - avl_remove_all_elements(&ses->data, data, avl, ndata) - free(data); - - avl_delete(&sessions, &ses->avl); - free(ses); -} - -static void uh_ubus_session_timeout(struct uloop_timeout *t) -{ - struct uh_ubus_session *ses; - - ses = container_of(t, struct uh_ubus_session, t); - uh_ubus_session_destroy(ses); -} - -static struct uh_ubus_session * -uh_ubus_session_create(int timeout) -{ - struct uh_ubus_session *ses; - - ses = calloc(1, sizeof(*ses)); - if (!ses) - return NULL; - - ses->timeout = timeout; - ses->avl.key = ses->id; - uh_ubus_random(ses->id); - - avl_insert(&sessions, &ses->avl); - avl_init(&ses->acls, avl_strcmp, true, NULL); - avl_init(&ses->data, avl_strcmp, false, NULL); - - ses->t.cb = uh_ubus_session_timeout; - uh_ubus_touch_session(ses); - - return ses; -} - -static struct uh_ubus_session * -uh_ubus_session_get(const char *id) -{ - struct uh_ubus_session *ses; - - ses = avl_find_element(&sessions, id, ses, avl); - if (!ses) - return NULL; - - uh_ubus_touch_session(ses); - return ses; -} - -static int -uh_ubus_handle_create(struct ubus_context *ctx, struct ubus_object *obj, - struct ubus_request_data *req, const char *method, - struct blob_attr *msg) -{ - struct uh_ubus_session *ses; - struct blob_attr *tb; - int timeout = conf.script_timeout; - - blobmsg_parse(&new_policy, 1, &tb, blob_data(msg), blob_len(msg)); - if (tb) - timeout = blobmsg_get_u32(tb); - - ses = uh_ubus_session_create(timeout); - if (ses) - uh_ubus_session_dump(ses, ctx, req); - - return 0; -} - -static int -uh_ubus_handle_list(struct ubus_context *ctx, struct ubus_object *obj, - struct ubus_request_data *req, const char *method, - struct blob_attr *msg) -{ - struct uh_ubus_session *ses; - struct blob_attr *tb; - - blobmsg_parse(&sid_policy, 1, &tb, blob_data(msg), blob_len(msg)); - - if (!tb) { - avl_for_each_element(&sessions, ses, avl) - uh_ubus_session_dump(ses, ctx, req); - return 0; - } - - ses = uh_ubus_session_get(blobmsg_data(tb)); - if (!ses) - return UBUS_STATUS_NOT_FOUND; - - uh_ubus_session_dump(ses, ctx, req); - - return 0; -} - -static int -uh_id_len(const char *str) -{ - return strcspn(str, "*?["); -} - -static int -uh_ubus_session_grant(struct uh_ubus_session *ses, struct ubus_context *ctx, - const char *object, const char *function) -{ - struct uh_ubus_session_acl *acl; - char *new_obj, *new_func, *new_id; - int id_len; - - if (!object || !function) - return UBUS_STATUS_INVALID_ARGUMENT; - - uh_foreach_matching_acl_prefix(acl, ses, object, function) { - if (!strcmp(acl->object, object) && - !strcmp(acl->function, function)) - return 0; - } - - id_len = uh_id_len(object); - acl = calloc_a(sizeof(*acl), - &new_obj, strlen(object) + 1, - &new_func, strlen(function) + 1, - &new_id, id_len + 1); - - if (!acl) - return UBUS_STATUS_UNKNOWN_ERROR; - - acl->object = strcpy(new_obj, object); - acl->function = strcpy(new_func, function); - acl->avl.key = strncpy(new_id, object, id_len); - avl_insert(&ses->acls, &acl->avl); - - return 0; -} - -static int -uh_ubus_session_revoke(struct uh_ubus_session *ses, struct ubus_context *ctx, - const char *object, const char *function) -{ - struct uh_ubus_session_acl *acl, *next; - int id_len; - char *id; - - if (!object && !function) { - avl_remove_all_elements(&ses->acls, acl, avl, next) - free(acl); - return 0; - } - - id_len = uh_id_len(object); - id = alloca(id_len + 1); - strncpy(id, object, id_len); - id[id_len] = 0; - - acl = avl_find_element(&ses->acls, id, acl, avl); - while (acl) { - if (!avl_is_last(&ses->acls, &acl->avl)) - next = avl_next_element(acl, avl); - else - next = NULL; - - if (strcmp(id, acl->avl.key) != 0) - break; - - if (!strcmp(acl->object, object) && - !strcmp(acl->function, function)) { - avl_delete(&ses->acls, &acl->avl); - free(acl); - } - acl = next; - } - - return 0; -} - - -static int -uh_ubus_handle_acl(struct ubus_context *ctx, struct ubus_object *obj, - struct ubus_request_data *req, const char *method, - struct blob_attr *msg) -{ - struct uh_ubus_session *ses; - struct blob_attr *tb[__UH_UBUS_SA_MAX]; - struct blob_attr *attr, *sattr; - const char *object, *function; - int rem1, rem2; - - int (*cb)(struct uh_ubus_session *ses, struct ubus_context *ctx, - const char *object, const char *function); - - blobmsg_parse(acl_policy, __UH_UBUS_SA_MAX, tb, blob_data(msg), blob_len(msg)); - - if (!tb[UH_UBUS_SA_SID]) - return UBUS_STATUS_INVALID_ARGUMENT; - - ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SA_SID])); - if (!ses) - return UBUS_STATUS_NOT_FOUND; - - if (!strcmp(method, "grant")) - cb = uh_ubus_session_grant; - else - cb = uh_ubus_session_revoke; - - if (!tb[UH_UBUS_SA_OBJECTS]) - return cb(ses, ctx, NULL, NULL); - - blobmsg_for_each_attr(attr, tb[UH_UBUS_SA_OBJECTS], rem1) { - if (blob_id(attr) != BLOBMSG_TYPE_ARRAY) - continue; - - object = NULL; - function = NULL; - - blobmsg_for_each_attr(sattr, attr, rem2) { - if (blob_id(sattr) != BLOBMSG_TYPE_STRING) - continue; - - if (!object) - object = blobmsg_data(sattr); - else if (!function) - function = blobmsg_data(sattr); - else - break; - } - - if (object && function) - cb(ses, ctx, object, function); - } - - return 0; -} - -static int -uh_ubus_handle_set(struct ubus_context *ctx, struct ubus_object *obj, - struct ubus_request_data *req, const char *method, - struct blob_attr *msg) -{ - struct uh_ubus_session *ses; - struct uh_ubus_session_data *data; - struct blob_attr *tb[__UH_UBUS_SA_MAX]; - struct blob_attr *attr; - int rem; - - blobmsg_parse(set_policy, __UH_UBUS_SS_MAX, tb, blob_data(msg), blob_len(msg)); - - if (!tb[UH_UBUS_SS_SID] || !tb[UH_UBUS_SS_VALUES]) - return UBUS_STATUS_INVALID_ARGUMENT; - - ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SS_SID])); - if (!ses) - return UBUS_STATUS_NOT_FOUND; - - blobmsg_for_each_attr(attr, tb[UH_UBUS_SS_VALUES], rem) { - if (!blobmsg_name(attr)[0]) - continue; - - data = avl_find_element(&ses->data, blobmsg_name(attr), data, avl); - if (data) { - avl_delete(&ses->data, &data->avl); - free(data); - } - - data = calloc(1, sizeof(*data) + blob_pad_len(attr)); - if (!data) - break; - - memcpy(data->attr, attr, blob_pad_len(attr)); - data->avl.key = blobmsg_name(data->attr); - avl_insert(&ses->data, &data->avl); - } - - return 0; -} - -static int -uh_ubus_handle_get(struct ubus_context *ctx, struct ubus_object *obj, - struct ubus_request_data *req, const char *method, - struct blob_attr *msg) -{ - struct uh_ubus_session *ses; - struct uh_ubus_session_data *data; - struct blob_attr *tb[__UH_UBUS_SA_MAX]; - struct blob_attr *attr; - struct blob_buf b; - void *c; - int rem; - - blobmsg_parse(get_policy, __UH_UBUS_SG_MAX, tb, blob_data(msg), blob_len(msg)); - - if (!tb[UH_UBUS_SG_SID]) - return UBUS_STATUS_INVALID_ARGUMENT; - - ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SG_SID])); - if (!ses) - return UBUS_STATUS_NOT_FOUND; - - memset(&b, 0, sizeof(b)); - blob_buf_init(&b, 0); - c = blobmsg_open_table(&b, "values"); - - if (!tb[UH_UBUS_SG_KEYS]) { - uh_ubus_session_dump_data(ses, &b); - return 0; - } - - blobmsg_for_each_attr(attr, tb[UH_UBUS_SG_KEYS], rem) { - if (blob_id(attr) != BLOBMSG_TYPE_STRING) - continue; - - data = avl_find_element(&ses->data, blobmsg_data(attr), data, avl); - if (!data) - continue; - - blobmsg_add_field(&b, blobmsg_type(data->attr), - blobmsg_name(data->attr), - blobmsg_data(data->attr), - blobmsg_data_len(data->attr)); - } - - blobmsg_close_table(&b, c); - ubus_send_reply(ctx, req, b.head); - blob_buf_free(&b); - - return 0; -} - -static int -uh_ubus_handle_unset(struct ubus_context *ctx, struct ubus_object *obj, - struct ubus_request_data *req, const char *method, - struct blob_attr *msg) -{ - struct uh_ubus_session *ses; - struct uh_ubus_session_data *data, *ndata; - struct blob_attr *tb[__UH_UBUS_SA_MAX]; - struct blob_attr *attr; - int rem; - - blobmsg_parse(get_policy, __UH_UBUS_SG_MAX, tb, blob_data(msg), blob_len(msg)); - - if (!tb[UH_UBUS_SG_SID]) - return UBUS_STATUS_INVALID_ARGUMENT; - - ses = uh_ubus_session_get(blobmsg_data(tb[UH_UBUS_SG_SID])); - if (!ses) - return UBUS_STATUS_NOT_FOUND; - - if (!tb[UH_UBUS_SG_KEYS]) { - avl_remove_all_elements(&ses->data, data, avl, ndata) - free(data); - return 0; - } - - blobmsg_for_each_attr(attr, tb[UH_UBUS_SG_KEYS], rem) { - if (blob_id(attr) != BLOBMSG_TYPE_STRING) - continue; - - data = avl_find_element(&ses->data, blobmsg_data(attr), data, avl); - if (!data) - continue; - - avl_delete(&ses->data, &data->avl); - free(data); - } - - return 0; -} - -static int -uh_ubus_handle_destroy(struct ubus_context *ctx, struct ubus_object *obj, - struct ubus_request_data *req, const char *method, - struct blob_attr *msg) -{ - struct uh_ubus_session *ses; - struct blob_attr *tb; - - blobmsg_parse(&sid_policy, 1, &tb, blob_data(msg), blob_len(msg)); - - if (!tb) - return UBUS_STATUS_INVALID_ARGUMENT; - - ses = uh_ubus_session_get(blobmsg_data(tb)); - if (!ses) - return UBUS_STATUS_NOT_FOUND; - - uh_ubus_session_destroy(ses); - - return 0; -} +#define UH_UBUS_MAX_POST_SIZE 4096 static char *split_str(char *str) { @@ -732,11 +193,9 @@ static void uh_ubus_defer_post(struct client *cl) static void uh_ubus_handle_request(struct client *cl, char *url, struct path_info *pi) { - struct uh_ubus_session_acl *acl; struct uh_ubus_session *ses; struct dispatch *d = &cl->dispatch; char *sid, *obj, *fun; - bool access = false; blob_buf_init(&buf, 0); @@ -747,12 +206,7 @@ static void uh_ubus_handle_request(struct client *cl, char *url, struct path_inf if (!ses) return ops->client_error(cl, 404, "Not Found", "No such session %s", sid); - uh_foreach_matching_acl(acl, ses, obj, fun) { - access = true; - break; - } - - if (!access) + if (!uh_ubus_session_acl_allowed(ses, obj, fun)) return ops->client_error(cl, 403, "Denied", "Access to object denied"); if (ubus_lookup_id(ctx, obj, &d->ubus.obj)) @@ -782,45 +236,18 @@ uh_ubus_init(void) .handle_request = uh_ubus_handle_request, }; - static const struct ubus_method session_methods[] = { - UBUS_METHOD("create", uh_ubus_handle_create, &new_policy), - UBUS_METHOD("list", uh_ubus_handle_list, &sid_policy), - UBUS_METHOD("grant", uh_ubus_handle_acl, acl_policy), - UBUS_METHOD("revoke", uh_ubus_handle_acl, acl_policy), - UBUS_METHOD("set", uh_ubus_handle_set, set_policy), - UBUS_METHOD("get", uh_ubus_handle_get, get_policy), - UBUS_METHOD("unset", uh_ubus_handle_unset, get_policy), - UBUS_METHOD("destroy", uh_ubus_handle_destroy, &sid_policy), - }; - - static struct ubus_object_type session_type = - UBUS_OBJECT_TYPE("uhttpd", session_methods); - - static struct ubus_object obj = { - .name = "session", - .type = &session_type, - .methods = session_methods, - .n_methods = ARRAY_SIZE(session_methods), - }; - - int ret; - ctx = ubus_connect(conf.ubus_socket); if (!ctx) { fprintf(stderr, "Unable to connect to ubus socket\n"); exit(1); } - ret = ubus_add_object(ctx, &obj); - if (ret) { - fprintf(stderr, "Unable to publish ubus object: %s\n", - ubus_strerror(ret)); + ops->dispatch_add(&ubus_dispatch); + if (ubus_session_api_init(ctx)) { + fprintf(stderr, "Unable to initialize ubus session API\n"); exit(1); } - avl_init(&sessions, avl_strcmp, false, NULL); - ops->dispatch_add(&ubus_dispatch); - uloop_done(); return 0; } |