+++ /dev/null
-/*
- * uhttpd - Tiny single-threaded httpd
- *
- * Copyright (C) 2010-2013 Jo-Philipp Wich <xm@subsignal.org>
- * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-#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);
- blobmsg_add_u32(&buf, "expires", uloop_timeout_remaining(&ses->t) / 1000);
-
- 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);
-}
projects / oweals / uhttpd.git / commitdiff