diff options
Diffstat (limited to 'ubus-session.c')
| -rw-r--r-- | ubus-session.c | 599 |
1 files changed, 599 insertions, 0 deletions
diff --git a/ubus-session.c b/ubus-session.c new file mode 100644 index 0000000..636db9b --- /dev/null +++ b/ubus-session.c @@ -0,0 +1,599 @@ +/* + * uhttpd - Tiny single-threaded httpd + * + * Copyright (C) 2010-2012 Jo-Philipp Wich <xm@subsignal.org> + * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org> + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <libubox/avl-cmp.h> +#include <libubox/utils.h> +#include <libubus.h> +#include <fnmatch.h> + +#include "ubus-session.h" + +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; + + blob_buf_init(&buf, 0); + + blobmsg_add_string(&buf, "sid", ses->id); + blobmsg_add_u32(&buf, "timeout", ses->timeout); + + c = blobmsg_open_table(&buf, "acls"); + uh_ubus_session_dump_acls(ses, &buf); + blobmsg_close_table(&buf, c); + + c = blobmsg_open_table(&buf, "data"); + uh_ubus_session_dump_data(ses, &buf); + blobmsg_close_table(&buf, c); + + ubus_send_reply(ctx, req, buf.head); +} + +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; +} + +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 = UBUS_DEFAULT_SESSION_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; + 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; + + blob_buf_init(&buf, 0); + c = blobmsg_open_table(&buf, "values"); + + if (!tb[UH_UBUS_SG_KEYS]) { + uh_ubus_session_dump_data(ses, &buf); + 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(&buf, blobmsg_type(data->attr), + blobmsg_name(data->attr), + blobmsg_data(data->attr), + blobmsg_data_len(data->attr)); + } + + blobmsg_close_table(&buf, c); + ubus_send_reply(ctx, req, buf.head); + + 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; +} + +bool uh_ubus_session_acl_allowed(struct uh_ubus_session *ses, const char *obj, const char *fun) +{ + struct uh_ubus_session_acl *acl; + + uh_foreach_matching_acl(acl, ses, obj, fun) + return true; + + return false; +} + +int ubus_session_api_init(struct ubus_context *ctx) +{ + 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), + }; + + avl_init(&sessions, avl_strcmp, false, NULL); + + return ubus_add_object(ctx, &obj); +} |